Prove all things. As rash men and deceiving spirits frequently pass off their trifles under the name of prophecy, prophecy might by this means be rendered suspicious or even odious, just as many in the present day feel almost disgusted with the very name of preaching, as there are so many foolish and ignorant persons that from the pulpit blab out their worthless contrivances, [1] while there are others, also, that are wicked and sacrilegious persons, who babble forth execrable blasphemies. [2] As, therefore, through the fault of such persons it might be, that prophecy was regarded with disdain, nay more, was scarcely allowed to hold a place, Paul exhorts the Thessalonians to prove all things, meaning, that although all do not speak precisely according to set rule, we must, nevertheless, form a judgment, before any doctrine is condemned or rejected. As to this, there is a twofold error that is wont to be fallen into, for there are some who, from having either been deceived by a false pretext of the name of God, or from their knowing that many are commonly deceived in this way, reject every kind of doctrine indiscriminately, while there are others that by a foolish credulity embrace, without distinction, everything that is presented to them in the name of God. Both of these ways are faulty, for the former class, saturated with a presumptuous prejudice of that nature, close up the way against their making progress, while the other class rashly expose themselves to all winds of errors. (Ephesians 4:14.) Paul admonishes the Thessalonians to keep the middle path between these two extremes, while he prohibits them from condemning anything without first examining it; and, on the other hand, he admonishes them to exercise judgment, before receiving, what may be brought forward, as undoubted truth. And unquestionably, this respect, at least, ought to be shewn to the name of God -- that we do not despise prophecy, which is declared to have proceeded from him. As, however, examination or discrimination ought to precede rejection, so it must, also, precede the reception of true and sound doctrine. For it does not become the pious to shew such lightness, as indiscriminately to lay hold of what is false equally with what is true. From this we infer, that they have the spirit of judgment conferred upon them by God, that they may discriminate, so as not to be imposed upon by the impostures of men. For if they were not endowed with discrimination, it were in vain that Paul said -- Prove: hold fast that which is good. If, however, we feel that we are left destitute of the power of proving aright; it must be sought by us from the same Spirit, who speaks by his prophets. But the Lord declares in this place by the mouth of Paul, that the course of doctrine ought not, by any faults of mankind, or by any rashness, or ignorance, or, in fine, by any abuse, to be hindered from being always in a vigorous state in the Church. For as the abolition of prophecy is the ruin of the Church, let us allow heaven and earth to be commingled, rather than that prophecy should cease. Paul, however, may seem here to give too great liberty in teaching, when he would have all things proved; for things must be heard by us, that they may be proved, and by this means a door would be opened to impostors for disseminating their falsehoods. I answer, that in this instance he does not by any means require that an audience should be given to false teachers, whose mouth he elsewhere teaches (Titus 1:11) must be stopped, and whom he so rigidly shuts out, and does not by any means set aside the arrangement, which he elsewhere recommends so highly (1-Timothy 3:2) in the election of teachers. As, however, so great diligence can never be exercised as that there should not sometimes be persons prophesying, who are not so well instructed as they ought to be, and that sometimes good and pious teachers fail to hit the mark, he requires such moderation on the part of believers, as, nevertheless, not to refuse to hear. For nothing is more dangerous, than that moroseness, by which every kind of doctrine is rendered disgusting to us, while we do not allow ourselves to prove what is right. [3]

Footnotes

1 - "Leurs speculations ridicules;" -- "Their ridiculous speculations."

2 - "Horribles et execrables;" -- "Horrible and execrable."

3 - "Tellement que nostre impatience ou chagrin nous empesche d'esprouuer qui est la vraye ou la fausse;" -- "So that our impatience or chagrin keeps us from proving what is true or false."

Prove all things - Subject everything submitted to you to be believed to the proper test. The word here used (δοκιμάζετε dokimazete), is one that is properly applicable to metals, referring to the art of the assayer, by which the true nature and value of the metal is tested; see notes, 1-Corinthians 3:13. This trial was usually made by fire. The meaning here is, that they were carefully to examine everything proposed for their belief. They were not to receive it on trust; to take it on assertion; to believe it because it was urged with vehemence, zeal, or plausibility. In the various opinions and doctrines which were submitted to them for adoption, they were to apply the appropriate tests from reason and the word of God, and what they found to be true they were to embrace; what was false they were to reject. Christianity does not require people to disregard their reason, or to be credulous. It does not expect them to believe anything because others say it is so. It does not make it a duty to receive as undoubted truth all that synods and councils have decreed; or all that is advanced by the ministers of religion. It is, more than any other form of religion, the friend of free inquiry, and would lead people everywhere to understand the reason of the opinions which they entertain; compare Acts 17:11-12; 1-Peter 3:15.
Hold fast that which is good - Which is in accordance with reason and the word of God; which is adapted to promote the salvation of the soul and the welfare of society. This is just as much a duty as it is to "prove all things." A man who has applied the proper tests, and has found out what is truth, is bound to embrace it and to hold it fast. He is not at liberty to throw it away, as if it were valueless; or to treat truth and falsehood alike. It is a duty which he owes to himself and to God to adhere to it firmly, and to suffer the loss of all things rather than to abandon it. There are few more important rules in the New Testament than the one in this passage. It shows what is the true nature of Christianity, and it is a rule whose practical value cannot but be felt constantly in our lives. Other religions require their votaries to receive everything upon trust; Christianity asks us to examine everything.
Error, superstition, bigotry, and fanaticism attempt to repress free discussion, by saying that there are certain things which are too sacred in their nature, or which have been too long held, or which are sanctioned by too many great and holy names, to permit their being subjected to the scrutiny of common eyes, or to be handled by common hands. In opposition to all this, Christianity requires us to examine everything - no matter by whom held; by what councils ordained; by what venerableness of antiquity sustained; or by what sacredness it may be invested. We are to receive no opinion until we are convinced that it is true; we are to be subjected to no pains or penalties for not believing what we do not perceive to be true; we are to be prohibited from examining no opinion which our fellow-men regard as true, and which they seek to make others believe. No popular current in favor of any doctrine; no influence which name and rank and learning can give it, is to commend it to us as certainly worthy of our belief. By whomsoever held, we are to examine it freely before we embrace it; but when we are convinced that it is true, it is to be held, no matter what current of popular opinion or prejudice maybe against it; no matter what ridicule may be poured upon it; and no matter though the belief of it may require us to die a martyr's death.

Prove all things - Whatever ye hear in these prophesyings or preachings, examine by the words of Christ, and by the doctrines which, from time to time, we have delivered unto you in our preaching and writings. Try the spirits - the different teachers, by the word of God.
Hold fast that which is good - Whatever in these prophesyings has a tendency to increase your faith, love, holiness, and usefulness, that receive and hold fast. There were prophets or teachers even at that time who professed to be of God, and yet were not.

Prove all things,.... That are said by the prophets, all the doctrines which they deliver; hear them, though they have not the gift of tongues, and all desirable advantages; do not reject them on that account, and refuse to hear them, for so, many useful men may be laid aside, and the Spirit of God in them be quenched; try their gifts, and attend to their doctrines, yet do not implicitly believe everything they say, but examine them according to the word of God the test and standard of truth; search the Scriptures, whether the things they say are true or not. Not openly erroneous persons, and known heretics, are to be heard and attended on, but the ministers of the word, or such who are said to have a gift of prophesying; these should make use of it, and the church should try and judge their gift, and accordingly encourage or discourage; and also their doctrines, and if false reject them, and if true receive them.
Hold fast that which is good; honest, pleasant, profitable, and agreeable to sound doctrine, to the analogy of faith, and the Scriptures of truth, and is useful and edifying, instructive both as to principle and practice; such should be held fast, that no man take it away; and be retained, though a majority may be against it, for the multitude is not always on the side of truth; and though it may be rejected by men of learning and wealth, as Christ and his doctrines were rejected by the Scribes and Pharisees, and rulers of the people; and though it may be reproached as a novel, upstart notion, or a licentious one, since these were charges against the doctrine of Christ, and his apostles; and though it may be attended with affliction and persecution, yet none of these things should move from it, or cause to let it go.

Some of the oldest manuscripts insert "But." You ought indeed not to "quench" the manifestations of "the Spirit," nor "despise prophesyings"; "but," at the same time, do not take "all" as genuine which professes to be so; "prove (test) all" such manifestations. The means of testing them existed in the Church, in those who had the "discerning of spirits" (1-Corinthians 12:10; 1-Corinthians 14:29; 1-John 4:1). Another sure test, which we also have, is, to try the professed revelation whether it accords with Scripture, as the noble Bereans did (Isaiah 8:20; Acts 17:11; Galatians 1:8-9). This precept negatives the Romish priest's assumption of infallibly laying down the law, without the laity having the right, in the exercise of private judgment, to test it by Scripture. LOCKE says, Those who are for laying aside reason in matters of revelation, resemble one who would put out his eyes in order to use a telescope.
hold fast that which is good--Join this clause with the next clause (1-Thessalonians 5:22), not merely with the sentence preceding. As the result of your "proving all things," and especially all prophesyings, "hold fast (Luke 8:15; 1-Corinthians 11:2; Hebrews 2:1) the good, and hold yourselves aloof from every appearance of evil" ("every evil species" [BENGEL and WAHL]). Do not accept even a professedly spirit-inspired communication, if it be at variance with the truth taught you (2-Thessalonians 2:2).

Meantime, prove all things - Which any preacher recommends. (He speaks of practice, not of doctrines.) Try every advice by the touchstone of scripture, and hold fast that which is good - Zealously, resolutely, diligently practise it, in spite of all opposition.