We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:

And we have the word of prophecy made more sure; whereunto ye do well that ye take heed, as unto a lamp shining in a dark place, until the day dawn, and the day-star arise in your hearts:

And we have the more firm prophetical word: whereunto you do well to attend, as to a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:

And we have the prophetic word made surer, to which ye do well taking heed (as to a lamp shining in an obscure place) until the day dawn and the morning star arise in your hearts;

We have also a more sure word of prophecy; to which ye do well that ye take heed, as to a light that shineth in a dark place, until the day dawn, and the day-star arise in your hearts:

And we have more firm the prophetic word, to which we do well giving heed, as to a lamp shining in a dark place, till day may dawn, and a morning star may arise, in your hearts;

We have also a more sure word of prophecy; whereunto you do well that you take heed, as to a light that shines in a dark place, until the day dawn, and the day star arise in your hearts:

And in the written word of prophecy we have something more permanent; to which you do well to pay attention - as to a lamp shining in a dimly-lighted place - until day dawns and the morning star rises in your hearts.

And so the words of the prophets are made more certain; and it is well for you to give attention to them as to a light shining in a dark place, till the dawn comes and the morning star is seen in your hearts;

And so, we have an even firmer prophetic word, to which you would do well to listen, as to a light shining within a dark place, until the day dawns, and the daystar rises, in your hearts.

And still stronger is the assurance that we have in the teaching of the prophets; to which you will do well to pay attention (as if it were a lamp shining in a gloomy place), until the day dawns and the morning star rises in your hearts.

We have also. He now shews that the truth of the gospel is founded on the oracles of the prophets, lest they who embraced it should hesitate to devote themselves wholly to Christ: for they who waver cannot be otherwise than remiss in their minds. But when he says, "We have," he refers to himself and other teachers, as well as to their disciples. The apostles had the prophets as the patrons of their doctrine; the faithful also sought from them a confirmation of the gospel. I am the more disposed to take this view, because he speaks of the whole Church, and makes himself one among others. At the same time, he refers more especially to the Jews, who were well acquainted with the doctrine of the prophets. And hence, as I think, he calls their word more sure or firmer For they who take the comparative for a positive, that is, "more sure," for "sure," do not sufficiently consider the whole context. The sense also is a forced one, when it is said to be "more sure," because God really completed what he had promised concerning his Son. For the truth of the gospel is here simply proved by a twofold testimony, -- that Christ had been highly approved by the solemn declaration of God, and, then, that all the prophecies of the prophets confirmed the same thing. But it appears at first sight strange, that the word of the prophets should be said to be more sure or firmer than the voice which came from the holy mouth of God himself; for, first, the authority of God's word is the same from the beginning; and, secondly, it was more confirmed than previously by the coming of Christ. But the solution of this knot is not difficult: for here the Apostle had a regard to his own nation, who were acquainted with the prophets, and their doctrine was received without any dispute. As, then, it was not doubted by the Jews but that all the things which the prophets had taught, came from the Lord, it is no wonder that Peter said that their word was more sure. Antiquity also gains some reverence. There are, besides, some other circumstances which ought to be noticed; particularly, that no suspicion could be entertained as to those prophecies in which the kingdom of Christ had so long before been predicted. The question, then, is not here, whether the prophets deserve more credit than the gospel; but Peter regarded only this, to shew how much deference the Jews paid to those who counted the prophets as God's faithful ministers, and had been brought up from childhood in their school. [1] Whereunto ye do well. This passage is, indeed, attended with some more difficulty; for it may be asked, what is the day which Peter mentions? To some it seems to be the clear knowledge of Christ, when men fully acquiesce in the gospel; and the darkness they explain as existing, when they, as yet, hesitate in suspense, and the doctrine of the gospel is not received as indubitable; as though Peter praised those Jews who were searching for Christ in the Law and the Prophets, and were advancing, as by this preceding light towards Christ, the Sun of righteousness, as they were praised by Luke, who, having heard Paul preaching, searched the Scripture to know whether what he said was true. (Acts 17:11) But in this view there is, first, an inconsistency, because it thus seems that the use of the prophecies is confined to a short time, as though they would be superfluous when the gospel-light is seen. Were one to object and say, that this does not necessarily follow, because until does not always denote the end. To this I say, that in commands it cannot be otherwise taken: "Walk until you finish your course;" "Fight until you conquer." In such expressions we doubtless see that a certain time is specified. [2] But were I to concede this point, that the reading of the prophets is not thus wholly cast aside; yet every one must see how frigid is this commendation, that the prophets are useful until Christ is revealed to us; for their teaching is necessary to us until the end of life. Secondly, we must bear in mind who they were whom Peter addressed; for he was not instructing the ignorant and novices, who were as yet in the first rudiments; but even those respecting whom he had before testified, that they had obtained the same precious faith, and were confirmed in the present truth. Surely the gross darkness of ignorance could not have been ascribed to such people. I know what some allege, that all had not made the same progress, and that here beginners who were as yet seeking Christ, are admonished. But as it is evident from the context, that the words were addressed to the same persons, the passage must necessarily be applied to the faithful who had already known Christ, and had become partakers of the true light. I therefore extend this darkness, mentioned by Peter, to the whole course of life, and the day, I consider will then shine on us when we shall see face to face, what we now see through a glass darkly. Christ, the Sun of righteousness, indeed, shines forth in the gospel; but the darkness of death will always, in part, possess our minds, until we shall be brought out of the prison of the flesh, and be translated into heaven. This, then, will be the brightness of day, when no clouds or mists of ignorance shall intercept the bright shining of the Sun. And doubtless we are so far from a perfect day, as our faith is from perfection. It is, therefore, no wonder that the state of the present life is called darkness, since we are far distant from that knowledge to which the gospel invites us. [3] In short, Peter reminds us that as long as we sojourn in this world, we have need of the doctrine of the prophets as a guiding light; which being extinguished, we can do nothing else but wander in darkness; for he does not disjoin the prophecies from the gospel, when he teaches us that they shine to shew us the way. His object only was to teach us that the whole course of our life ought to be guided by God's word; for otherwise we must be involved on every side in the darkness of ignorance; and the Lord does not shine on us, except when we take his word as our light. But he does not use the comparison, light, or lamp, to intimate that the light is small and sparing, but to make these two things to correspond,--that we are without light, and can no more keep on the right way than those who go astray in a dark night; and that the Lord brings a remedy for this evil, when he lights a torch to guide us in the midst of darkness. What he immediately adds respecting the day star does not however seem altogether suitable to this explanation; for the real knowledge, to which we are advancing through life, cannot be called the beginning of the day. To this I reply, that different parts of the day are compared together, but the whole day in all its parts is set in opposition to that darkness, which would wholly overspread all our faculties, were not the Lord to come to our help by the light of his word. This is a remarkable passage: we learn from it how God guides us. The Papists have ever and anon in their mouth, that the Church cannot err. Though the word is neglected, they yet imagine that it is guided by the Spirit. But Peter, on the contrary, intimates that all are immersed in darkness who do not attend to the light of the word. Therefore, except thou art resolved wilfully to cast thyself into a labyrinth, especially beware of departing even in the least thing from the rule and direction of the word. Nay, the Church cannot follow God as its guide, except it observes what the word prescribes. In this passage Peter also condemns all the wisdom of men, in order that we may learn humbly to seek, otherwise than by our own understanding, the true way of knowledge; for without the word nothing is left for men but darkness. It further deserves to be noticed, that he pronounces on the clearness of Scripture; for what is said would be a false eulogy, were not the Scripture fit and suitable to shew to us with certainty the right way. Whosoever, then, will open his eyes through the obedience of faith, shall by experience know that the Scripture has not been in vain called a light. It is, indeed, obscure to the unbelieving; but they who are given up to destruction are wilfully blind. Execrable, therefore, is the blasphemy of the Papists, who pretend that the light of Scripture does nothing but dazzle the eyes, in order to keep the simple from reading it. But it is no wonder that proud men, inflated with the wind of false confidence, do not see that light with which the Lord favors only little children and the humble. With a similar eulogy David commends the law of God in Psalms 19 and 119.

Footnotes

1 - Much has been written on this subject; and the difficulty has arisen from a wrong construction of the passage, which is literally as follows: -- "And we have more firm the prophetic word," Kai echomen bebaioteron ton prophetikon logon, that is, we have rendered more firm the prophetic word. This is confirmed by what follows; for the prophetic word is compared to "a light shining in a dark place," and, therefore, not clear nor firm until it be fulfilled; but they were doing well to attend to this light until the full light of the gospel shone in their hearts. As Scott maintains, the reference here is clearly to the experience of Christians to their real knowledge of divine truths; for it was to be in their hearts, and not before their eyes A great deal of learning has been spent to no purpose on this passage. It has been by most taken as granted, that "the power and coming of our Lord," mentioned in verse 16th, is his second coming, when the whole passage refers only and expressly to his first coming. And on this gratuitous and even false supposition is grounded the elaborate exposition of Sherlock, Horsley, and others. -- Ed.

2 - There is no command here: the Apostle only approves of what they were doing, "whereunto ye do well that ye take heed." -- Ed.

3 - The Apostle does not speak of the perfect day, but of the dawn of it, and the daystar is that which ushers in the perfect day. The gospel is the dawn and the daystar, compared with the glimmering light of prophecy, and compared too with the perfect day of the heavenly kingdom. Prophecy is useful still; for its fulfillment, found in the gospel, greatly strengthens faith. -- Ed.

We have also a more sure word of prophecy - That is, a prophecy pertaining to the coming of the Lord Jesus; for that is the point under discussion. There has been considerable diversity of opinion in regard to the meaning of this passage. Some have supposed that the apostle, when he says, "a more sure word," did not intend to make any comparison between the miracle of the transfiguration and prophecy, but that he meant to say merely that the word of prophecy was very sure, and could certainly be relied on. Others have supposed that the meaning is, that the prophecies which foretold his coming into the world having been confirmed by the fact of his advent, are rendered more sure and undoubted than when they were uttered, and may now be confidently appealed to. So Rosenmuller, Benson, Macknight, Clarke, Wetstein, and Grotius. Luther renders it, "we have a firm prophetic word;" omitting the comparison.
A literal translation of the passage would be," and we have the prophetic word more firm." If a comparison is intended, it may be either that the prophecy was more sure than the fables referred to in 2-Peter 1:16; or than the miracle of the transfiguration; or than the word which was heard in the holy mount; or than the prophecies even in the time when they were first spoken. If such a comparison was designed, the most obvious of these interpretations would be, that the prophecy was more certain proof than was furnished in the mount of transfiguration. But it seems probable that no comparison was intended, and that the thing on which Peter intended to fix the eye was not that the prophecy was a better evidence respecting the advent of the Messiah than other evidences, but that it was a strong proof which demanded their particular attention, as being of a firm and decided character. There can be no doubt that the apostle refers here to what is contained in the Old Testament; for, in 2-Peter 1:21, he speaks of the prophecy as that which was spoken "in old time, by men that were moved by the Holy Ghost." The point to which the prophecies related, and to which Peter referred, was the great doctrine respecting the coming of the Messiah, embracing perhaps all that pertained to his work, or all that he designed to do by his advent.
They had had one illustrious proof respecting his advent as a glorious Saviour by his transfiguration on the mount; and the apostle here says that the prophecies abounded with truths on these points, and that they ought to give earnest heed to the disclosures which they made, and to compare them diligently with facts as they occurred, that they might be confirmed more and more in the truth. If, however, as the more obvious sense of this passage seems to be, and as many suppose to be the correct interpretation (see Doddridge, in loc., and Professor Stuart, on the Canon of the Old Testament, p. 329), it means that the prophecy was more sure, more steadfast, more to be depended on than even what the three disciples had seen and heard in the mount of transfiguration, this may be regarded as true in the following respects:
(1) The prophecies are numerous, and by their number they furnish a stronger proof than could be afforded by a single manifestation. however clear and glorious.
(2) they were "recorded," and might be the subject of careful comparison with the events as they occurred.
(3) they were written long beforehand, and it could not be urged that the testimony which the prophets bore was owing to any illusion on their minds, or to any agreement among the different writers to impose on the world. Though Peter regarded the testimony which he and James and John bore to the glory of the Saviour, from what they saw on the holy mount, as strong and clear confirmation that he was the Son of God, yet he could not but be aware that it might be suggested by a caviller that they might have agreed to impose on others, or that they might have been dazzled and deceived by some natural phenomenon occurring there. Compare Kuinoel on Matthew 17:1, following.
(4) even supposing that there was a miracle in the case, the evidence of the prophecies, embracing many points in the same general subject, and extending through a long series of years, would be more satisfactory than any single miracle whatever. See Doddridge, in loc. The general meaning is, that the fact that he had come as the Messiah was disclosed in the mount by such a manifestation of his glory, and of what he would be, that they who saw it could not doubt it; the same thing the apostle says was more fully shown also in the prophecies, and these prophecies demanded their close and prolonged attention.
Whereunto ye do well that ye take heed - They are worthy of your study, of your close and careful investigation. There is perhaps no study more worthy of the attention of Christians than that of the prophecies.
As unto a light that shineth in a dark place - That is, the prophecies resemble a candle, lamp, or torch, in a dark room, or in an obscure road at night. They make objects distinct which were before unseen; they enable us to behold many things which would be otherwise invisible. The object of the apostle in this representation seems to have been, to state that the prophecies do not give a perfect light, or that they do not remove all obscurity, but that they shed some light on objects which would otherwise be entirely dark, and that the light which they furnished was so valuable that we ought by all means to endeavor to avail ourselves of it. Until the day shall dawn, and we shall see objects by the clear light of the sun, they are to be our guide. A lamp is of great value in a dark night, though it may not disclose objects so clearly as the light of the sun. But it may be a safe and sure guide; and a man who has to travel in dark and dangerous places, does well to "take heed" to his lamp.
Until the day dawn - Until you have the clearer light which shall result from the dawning of the day. The reference here is to the morning light as compared with a lamp; and the meaning is, that we should attend to the light furnished by the prophecies until the truth shall be rendered more distinct by the events as they shall actually be disclosed - until the brighter light which shall be shed on all things by the glory of the second advent of the Saviour, and the clearing up of what is now obscure in the splendors of the heavenly world. The point of comparison is between the necessary obscurity of prophecy, and the clearness of events when they actually occur - a difference like that which is observable in the objects around us when seen by the shining of the lamp and by the light of the sun. The apostle directs the mind onward to a period when all shall be clear - to that glorious time when the Saviour shall return to receive his people to himself in that heaven where all shall be light. Compare Revelation 21:23-25; Revelation 22:5. Meantime we should avail ourselves of all the light which we have, and should apply ourselves diligently to the study of the prophecies of the Old Testament which are still unfulfilled, and of those in the New Testament which direct the mind onward to brighter and more glorious scenes than this world has yet witnessed. In our darkness they are a cheering lamp to guide our feet, till that illustrious day shall dawn. Compare the notes at 1-Corinthians 13:9-10.
And the day-star - The morning star - the bright star that at certain periods of the year leads on the day, and which is a pledge that the morning is about to dawn. Compare Revelation 2:28; Revelation 22:16.
Arise in your hearts - on your hearts; that is, sheds its beams on your hearts. Until you see the indications of that approaching day in which all is light. The period referred to here by the approaching day that is to diffuse this light, is when the Saviour shall return in the full revelation of his glory - the splendor of his kingdom. Then all will be clear. Until that time, we should search the prophetic records, and strengthen our faith, and comfort our hearts, by the predictions of the future glory of his reign. Whether this refers, as some suppose, to his reign on earth, either personally or by the principles of his religion universally prevailing, or, as others suppose, to the brighter revelations of heaven when he shall come to receive his people to himself, it is equally clear that a brighter time than any that has yet occurred is to dawn on our race, and equally true that we should regard the prophecies, as we do the morning star, as the cheering harbinger of day.

We have also a more sure word of prophecy - Εχομεν βεβαιοτερον τον προφητικον λογον· We have the prophetic doctrine more firm or more confirmed; for in this sense the word βεβαιοω is used in several places in the New Testament. See 1-Corinthians 1:6 : Even as the testimony of Christ εβεβαιωθη, was Confirmed, among you. 2-Corinthians 1:21 : Now he which stablisheth us, ὁ δε βεβαιων ἡμας, who Confirmeth Us. Colossians 2:7 : Rooted and built up in him, and established in the faith, βεβαιουμενοι, Confirmed in the faith. Hebrews 2:3 : How shall we escape if we neglect so great salvation ἡτις εβεβαιωτη, which was Confirmed to us. Hebrews 6:16 : And an oath, εις βεβαιωσιν, for Confirmation. This is the literal sense of the passage in question; and this sense removes that ambiguity from the text which has given rise to so many different interpretations. Taken according to the common translation, it seems to say that prophecy is a surer evidence of Divine revelation than miracles; and so it has been understood. The meaning of the apostle appears to be this: The law and the prophets have spoken concerning Jesus Christ, and Isaiah has particularly pointed him out in these words: Behold my servant whom I uphold, my Chosen in Whom My Soul Delighteth; I have put my Spirit upon him, and he shall bring forth judgment to the Gentiles; to open the blind eyes, to bring out the prisoners from the prison, and Them That Sit in Darkness out of the prison house, Isaiah 42:1, Isaiah 42:7. Now both at his baptism, Matthew 3:17, and at his transfiguration, Jesus Christ was declared to be this chosen person, God's only Son, the beloved One in Whom He Delighted. The voice, therefore, from heaven, and the miraculous transfiguration of his person, have confirmed the prophetic doctrine concerning him. And to this doctrine, thus confirmed, ye do well to take heed; for it is that light that shines in the dark place - in the Gentile world, as well as among the Jews; giving light to them that sit in darkness, and bringing the prisoners out of the prison house: and this ye must continue to do till the day of his second, last, and most glorious appearing to judge the world comes; and the day star, φωσφορος, this light-bringer, arise in your hearts - manifest himself to your eternal consolation. Or perhaps the latter clause of the verse might be thus understood: The prophecies concerning Jesus, which have been so signally confirmed to us on the holy mount, have always been as a light shining in a dark place, from the time of their delivery to the time in which the bright day of Gospel light and salvation dawned forth, and the Son of righteousness has arisen in our souls, with healing in his rays. And to this all who waited for Christ's appearing have taken heed. The word φωσφορος, phosphorus, generally signified the planet Venus, when she is the morning star; and thus she is called in most European nations.

(11) We have also a more sure word of prophecy; (12) whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day (l) dawn, and the (m) day star arise in your hearts:
(11) The truth of the gospel is by this revealed, in that it agrees wholly with the foretellings of the prophets.
(12) The doctrine of the apostles does not contradict the doctrine of the prophets, for they confirm each other by each others testimonies, but the prophets were like candles which gave light to the blind, until the brightness of the gospel began to shine.
(l) A more full and open knowledge, than was under the shadows of the law.
(m) That clearer doctrine of the gospel.

Though this word of prophecy is generally understood of the writings and prophecies of the Old Testament concerning Christ, yet different ways are taken to fix the comparison: some think the sense is, that they are more sure than the cunningly devised fables, 2-Peter 1:16 but as these have no certainty nor authority in them, but are entirely to be rejected, the apostle would never put the sacred writings in comparison with them: and it is most clear, that the comparison lies between this word of prophecy, and the testimony of the apostles, who were eye and ear witnesses of the majesty and glory of Christ; but how prophecy should be a surer evidence of Christ, and the Gospel, than such a testimony, is difficult to understand; and is a sense which all agree to reject, by different methods: some think that a comparative is used for a positive, and that the meaning is, that besides the testimony of the apostles, prophecy is a very sure evidence; and this is countenanced by the Syriac version, which renders it, "and we have also a firm", or "true word of prophecy"; to which the Arabic agrees, "and we have a word of prophecy very true": others choose to retain the comparison, and which indeed ought not to be thrown out; but these are divided about it; some are of opinion that it is to be understood of the Jews to whom the apostle writes, and he himself was one, and the sense to be this; not that prophecy in itself was surer than an apostolical testimony, but that it was surer to the Jews, and more valid with them, who had been trained up in, and long used to the prophetic writings; and who had a greater esteem for the prophets of the Old Testament than for the apostles of the New; but it is scarcely credible that the apostle, who had been an eye and ear witness in the holy mount, would put himself in among them, and say, "we have", &c. for whatever prophecy was to them, it could not be surer to him than what he had seen with his eyes, and heard with his ears. Others suppose that the meaning is, that prophecy was "now" surer to the Christians than it was "before", it being confirmed and established by facts and events, and also by miracles, and even by the attestation of this voice heard on the mount, and by the majesty of Christ seen there; but if this had been the sense of the apostle, he would have used these words, "now" and "before"; and besides, this puts the comparison quite out of its place, which manifestly stands between former prophecy, and the present testimony of the apostles: but the truth of the matter is, that this word of prophecy is not to be understood of the prophetic writings of the Old Testament; for though these are the word of God, and do testify of Christ, and are to be taken heed, and attended to, as proofs and evidence of Gospel truths, and are a light to direct and guide in matters both of faith and practice, yet they are not the only light, and are far from being the clearest, and what are only to be attended to; for the Gospel that came by Christ, and is preached by his apostles, and is contained in the writings of the New Testament, is a much clearer light, and at least equally to be attended to: nor are the prophecies of the Old Testament, which particularly relate to Christ, designed; there are many of this kind, which, put together, may very well be called the word of prophecy, and which were to the Jews a light in a dark place, until Christ came in the flesh; and though they are to be attended to, and compared with facts, to show the truth of the divine revelation, yet they are not a surer evidence, nor so sure an evidence, as the evangelical testimony is, which is of facts, and these supported by miracles; for now the dayspring from on high hath visited us, and Christ, the bright and morning star, has appeared: but the word of prophecy, concerning Christ's second coming, is here intended, whether it lies in the words of the prophets of the Old Testament, as in Psalm 96:13 or in the words of Christ, Matthew 16:27, which latter is most likely. The Ethiopic version understands this of some particular prophecy, and as if the words were a citation of some prophet, rendering the words thus, "and we have a voice more ancient than this of a prophet, saying, ye do well who take heed", &c. Sir Isaac Newton is of opinion, that the apostle refers to the book of the Revelation of St. John, which would not be unlikely, could it be proved that it was then written. Now this prophecy or prediction, concerning Christ's coming again with power and great glory, was a surer evidence of it than what the apostles saw with their eyes, and heard with their ears upon the mount; nothing was surer to them, nor could anything make it surer to them, that he was honoured and glorified, than what they saw and heard: but then this did not so certainly prove that he would hereafter be glorified, or come again in glory. What they saw and heard was a presumptive proof that it "might" be so, and was a confirming pledge and evidence to them that so it "would" be, and was a glorious representation of it; but Christ's prophecy or prediction, that so it "should" be, more strongly ascertained it, since he said it, to whom all things were known from the beginning, and whose counsel shall stand, and not one word of his shall ever fail.
Whereunto ye do well, that ye take heed as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts. The prophecy concerning Christ's second coming is as "as a light"; it is a revelation of that which was in the dark, lay hid as a secret and mystery in the heart of God; and which could not be known by men, had it not been foretold by God; and it is made as prophecy in all other cases is, by throwing light, as to this affair, into the mind of him, or them, to whom it is revealed; and is a light to them to whom it is delivered, and which they should attend unto, as to a lamp or torch to guide and direct them; though in some sense it is but a feeble one, and is as a light "that shineth in a dark place"; meaning not the world, which is a place of darkness, ignorance, and error; nor merely the state of the saints in general in this life, who, at most and best, see but through a glass darkly; but has a particular respect to the darkness which attends the saints, concerning the second coming of Christ, and which will especially attend them a little before that time. Prophecy holds out clearly that Christ will come again; that he will come in great glory, in his Father's, and in his own, and in the glory of his angels, and with great power, to raise the dead, and judge mankind; and though it gives hints, that, upon this, the saints shall be with Christ in the air, on earth, and in heaven; and that there will be new heavens, and a new earth; and that the saints shall reign here with Christ a thousand years, after which the Gog and Magog army will attack them without success; yet these are not so clear, as for saints to be agreed in the sense of them; and much more are they in the dark about the time of his coming. Now prophecy is the surest evidence and best light the saints have concerning this matter, "until the day dawn"; not the Gospel day, so much spoken of by the prophets, that had dawned already; rather a more clear knowledge of Christ, and Gospel truths, which will be in the spiritual kingdom and reign of Christ hereafter; or else the latter day glory, at the personal coming of Christ, when the light of the moon shall be as that of the sun, and that of the sun shall be sevenfold as the light of seven days; yea, when there will be no need of sun or moon, but Christ shall be come, and be the light of his people; see Isaiah 30:26 after which will follow the everlasting day of glory, when all darkness will be gone, and saints shall see face to face, and know as they are known:
and the day star arise in your hearts; or "the sun", as the Syriac version renders it; not Christ, the morning star, the dayspring from on high, and the sun of righteousness, who was already risen upon them; nor the grace of God implanted in their hearts, by which they were already called out of darkness, and made light in the Lord; but as the day star is the bringer of light, as the word used signifies, or the forerunner of the day, so it here intends the immediate signs and forerunners of the coming of Christ; which when observed in their hearts, and by their understandings, as being come to pass, they may lift up their heads with joy, because their redemption draws near, Luke 21:28 and so the Ethiopic here renders it, "and redemption, arise for you in your hearts". Now till this time the sure word of prophecy concerning Christ's second coming is to be "taken heed unto", as a lamp, light, and torch, to direct us to it, to encourage us to love it, long for it, and hasten to it: and in so doing we shall "do well"; it will be well for the glory of God and Christ, this being setting our seals to them as true; and well for ourselves to keep up our faith, hope, and expectation of it, unmoved.

We--all believers.
a more sure--rather as Greek, "we have the word of prophecy more sure (confirmed)." Previously we knew its sureness by faith, but, through that visible specimen of its hereafter entire fulfilment, assurance is made doubly sure. Prophecy assures us that Christ's sufferings, now past, are to be followed by Christ's glory, still future: the Transfiguration gives us a pledge to make our faith still stronger, that "the day" of His glory will "dawn" ere long. He does not mean to say that "the word of prophecy," or Scripture, is surer than the voice of God heard at the Transfiguration, as English Version; for this is plainly not the fact. The fulfilment of prophecy so far in Christ's history makes us the surer of what is yet to be fulfilled, His consummated glory. The word was the "lamp (Greek for 'light') heeded" by Old Testament believers, until a gleam of the "day dawn" was given at Christ's first coming, and especially in His Transfiguration. So the word is a lamp to us still, until "the day" burst forth fully at the second coming of "the Sun of righteousness." The day, when it dawns upon you, makes sure the fact that you saw correctly, though indistinctly, the objects revealed by the lamp.
whereunto--to which word of prophecy, primarily the Old Testament in Peter's day; but now also in our day the New Testament, which, though brighter than the Old Testament (compare 1-John 2:8, end), is but a lamp even still as compared with the brightness of the eternal day (compare 2-Peter 3:2). Oral teachings and traditions of ministers are to be tested by the written word (Acts 17:11).
dark--The Greek implies squalid, having neither water nor light: such spiritually is the world without, and the smaller world (microcosm) within, the heart in its natural state. Compare the "dry places" Luke 11:24 (namely, unwatered by the Spirit), through which the unclean spirit goeth.
dawn--bursting through the darkness.
day star--Greek, the morning star," as Revelation 22:16. The Lord Jesus.
in your hearts--Christ's arising in the heart by His Spirit giving full assurance, creates spiritually full day in the heart, the means to which is prayerfully giving heed to the word. This is associated with the coming of the day of the Lord, as being the earnest of it. Indeed, even our hearts shall not fully realize Christ in all His unspeakable glory and felt presence, until He shall come (Malachi 4:2). Isaiah 66:14-15, "When you see this, your heart shall rejoice . . . For, behold, the Lord will come." However, TREGELLES' punctuation is best, "whereunto ye do well to take heed (as unto a light shining in a dark place, until the day have dawned and the morning star arisen) in your hearts." For the day has already dawned in the heart of believers; what they wait for is its visible manifestation at Christ's coming.

We have also a more sure word of prophecy. Prophecy was a sure word, but when fulfilled in Christ and the gospel it seemed more sure. No class of evidence had more power with Jews than to show them that Jesus was the Christ of whom the prophets spoke.
Whereunto. To prophecy.
Take heed. Heed its predictions and statements concerning Christ.
As unto a lamp. It was a lamp shining in the darkness of the past and giving some light before the day star arose.
The day dawn. The full light of the New Testament.
The day star. Christ. See Revelation 22:16.
Knowing this first. This is a reason for giving heed to the word of prophecy.
That no prophecy . . . is of any private interpretation. Is not an interpretation of the knowledge and feelings of the prophet, but of the will of God. The next verse shows that this is the meaning.
For no prophecy. No scriptural prophecy is due to the will of man, but all came from men speaking from God when moved by the Holy Spirit. Prophecy is God's word, not the words of man.

And we - St. Peter here speaks in the name of all Christians. Have the word of prophecy - The words of Moses, Isaiah, and all the prophets, are one and the same word, every way consistent with itself. St. Peter does not cite any particular passage, but speaks of their entire testimony. More confirmed - By that display of his glorious majesty. To which word ye do well that ye take heed, as to a lamp which shone in a dark place - Wherein there was neither light nor window. Such anciently was the whole world, except that little spot where this lamp shone. Till the day should dawn - Till the full light of the gospel should break through the darkness. As is the difference between the light of a lamp and that of the day, such is that between the light of the Old Testament and of the New. And the morning star - Jesus Christ, Revelation 22:16. Arise in your hearts - Be revealed in you.