He therefore makes a preface by saying that he had many things to say, but that they were to prepare themselves lest these things should be said in vain. He reminds them that they were hard or difficult things; not indeed to repel them, but to stimulate them to greater attention. For as things that are easily understood render us slothful, so we become more keenly bent on hearing when anything obscure is set before us. He however states that the cause of the difficulty was not in the subject but in themselves. And indeed the Lord speaks to us so clearly and without any obscurity, that his word is rightly called our light; but its brightness become dim through our darkness. [1] This happens partly through our dullness and partly through our sloth; for though we are very dull to understand the truth of God, yet there is to be added to this vice the depravity of our affections, for we apply our minds to vanity rather than to God's truth. We are also continually impeded either by our perverseness, or by the cares of the world, or by the lusts of our flesh. Of whom does not refer to Christ, but to Melchisedec; yet he is not referred to as a private man, but as the type of Christ, and in a manner personating him.

Footnotes

1 - The literal rendering is "Of whom we have many a word to say, and hardly explainable," or hard to be explained. This hardness of explanation was however owing to their dullness of comprehension, as Calvin justly observes. "Hard to be uttered" of our version is not correct; nor is "hard to be understood" of Doddridge right. Macknight gives the true meaning, "difficult to be explained." Beza's is the same. The reason is added "Since dull (or sluggish) ye are become in ears," or in hearings. To be dull in ears is to be inattentive; but to be sluggish in ears seems to mean stupidity, slowness of comprehension. The latter is evidently meant here; that is, a tardiness or slowness in understanding. To hear with the ear is in the language of Scripture to understand. (Matthew 11:15; John 8:43; 1-Corinthians 14:2.) Hence to be sluggish in ears is to be slow or tardy in understanding the Word of God. Stuart therefore gives the sense, "Since ye are dull of apprehension." -- Ed.

Of whom we have many things to say - There are many things which seem strange in regard to him; many things which are hard to be understood. Paul knew that what be had to say of this man as a type of the Redeemer would excite wonder, and that many might be disposed to call it in question. He knew that in order to be understood, what he was about to say required a familiar acquaintance with the Scriptures, and a strong and elevated faith. A young convert; one who had just commenced the Christian life, could hardly expect to be able to understand it. The same thing is true now. One of the first questions which a young convert often asks, is, Who was Melchizedek? And one of the things which most uniformly perplex those who begin to study the Bible, is, the statement which is made about this remarkable man.
Hard to be uttered - Rather, hard to be "interpreted," or "explained." So the Greek word means.
Seeing ye are dull of hearing - That is, when they ought to have been acquainted with the higher truths of religion, they had shown that they received them slowly, and were dull of apprehension. On what particular "fact" Paul grounded this charge respecting them is unknown; nor could we know, unless we were better acquainted with the persons to whom he wrote, and their circumstances, than we now are. But he had doubtless in his eye some fact which showed that they were slow to understand the great principles of the gospel.

Of whom we have many things to say - The words περι οὑ, which we translate of whom, are variously applied:
1. To Melchisedec;
2. To Christ;
3. To the endless priesthood.
Those who understand the place of Melchisedec, suppose that it is in reference to this that the apostle resumes the subject in the seventh chapter, where much more is said on this subject, though not very difficult of comprehension; and indeed it is not to be supposed that the Hebrews could be more capable of understanding the subject when the apostle wrote the seventh chapter than they were when, a few hours before, he had written the fifth. It is more likely, therefore, that the words are to be understood as meaning Jesus, or that endless priesthood, of which he was a little before speaking, and which is a subject that carnal Christians cannot easily comprehend.
Hard to be uttered - Δυσερμηνευτος· Difficult to be interpreted, because Melchisedec was a typical person. Or if it refer to the priesthood of Christ, that is still more difficult to be explained, as it implies, not only his being constituted a priest after this typical order, but his paying down the ransom for the sins of the whole world; and his satisfying the Divine justice by this sacrifice, but also thereby opening the kingdom of heaven to all believers, and giving the whole world an entrance to the holy of holies by his blood.
Dull of hearing - Νωθροι ταις ακοαις· Your souls do not keep pace with the doctrines and exhortations delivered to you. As νωθρος signifies a person who walks heavily and makes little speed, it is here elegantly applied to those who are called to the Christian race, have the road laid down plain before them, how to proceed specified, and the blessings to be obtained enumerated, and yet make no exertions to get on, but are always learning, and never able to come to the full knowledge of the truth.

(6) Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
(6) A digression until he comes to the beginning of the seventh chapter; (Hebrews 5:11-6:20): in which he partly holds the Hebrews in the diligent consideration of those things which he has said, and partly prepares them for the understanding of those things of which he will speak.

Of whom we have many things to say,.... Either of Melchizedek, or of Christ, or of his priesthood or of all of these; since the apostle does largely treat of them in the following chapters: he says many things concerning Melchizedek in the seventh chapter, and many things of Christ, and his priesthood, in those that follow; Christ is a large and inexhaustible subject in the Gospel ministry, and what a Gospel minister delights to dwell on; and it is a fund and stock from whence he is furnished with things of the greatest usefulness, and of the utmost importance:
and hard to be uttered; as were many things respecting Melchizedek, mentioned in Hebrews 7:3 and also concerning Christ, and his priesthood: abstruse and difficult things are to be looked into, considered, searched after, and insisted on: the whole Scripture is profitable, and the whole counsel of God is to be declared, and things hard to be explained should be attempted; this is the way to an increase of light and knowledge; though it becomes ministers to consult their own abilities, and the capacity of their hearers, that they do not go beyond them:
seeing ye are dull of hearing; this dulness of hearing is thought by some to arise from their afflictions; or from their attachment to the law of Moses; or rather from their sluggishness, indocility, and want of industry; and often times this arises from pride and prejudice, and irreverence of the word of God; and frequently from the deceitfulness of riches, and the cares of this life.

Dull hearers make the preaching of the gospel difficult, and even those who have some faith may be dull hearers, and slow to believe. Much is looked for from those to whom much is given. To be unskilful, denotes want of experience in the things of the gospel. Christian experience is a spiritual sense, taste, or relish of the goodness, sweetness, and excellence of the truths of the gospel. And no tongue can express the satisfaction which the soul receives, from a sense of Divine goodness, grace, and love to it in Christ.

Here he digresses to complain of the low spiritual attainments of the Palestinian Christians and to warn them of the danger of falling from light once enjoyed; at the same time encouraging them by God's faithfulness to persevere. At Hebrews 6:20 he resumes the comparison of Christ to Melchisedec.
hard to be uttered--rather as Greek, "hard of interpretation to speak." Hard for me to state intelligibly to you owing to your dulness about spiritual things. Hence, instead of saying many things, he writes in comparatively few words (Hebrews 13:22). In the "we," Paul, as usual, includes Timothy with himself in addressing them.
ye are--Greek, "ye have become dull" (the Greek, by derivation, means hard to move): this implies that once, when first "enlightened," they were earnest and zealous, but had become dull. That the Hebrew believers AT JERUSALEM were dull in spiritual things, and legal in spirit, appears from Acts 21:20-24, where James and the elders expressly say of the "thousands of Jews which believe," that "they are all zealous of the law"; this was at Paul's last visit to Jerusalem, after which this Epistle seems to have been written (see on Hebrews 5:12, on "for the time").

Of whom we have many things to say. Of Christ in his priesthood.
Hard to be uttered. Hard to be expressed so that you will understand. The priesthood of Christ, after the order of Melchizedek, opens up some difficult questions.
Seeing ye are dull of hearing. Of slow understanding.
When ye ought to be teachers. You have been disciples long enough to be able to teach others, but still need some one to teach you first principles. See notes on Hebrews 6:1-2.
Oracles of God. God's word.
Every one that useth milk, etc. Those who only understand the A B C's of Christianity are only babes in Christ, like the babes whose food is milk. Such an one cannot handle the word of righteousness skillfully.
Strong meat belongeth to them that are of full age. When one has reached manhood we do not expect him to live on the food of babes. So a church member, as time goes on, ought to feed on strong meat, the higher teaching of religion. There should be growth in knowledge.
Their senses exercised. The reference here is to the faculties of the soul. A Christian ought to study, to gain a thorough knowledge of the Scriptures and especially of the New Testament, to become able to teach others, and to explain the higher principles of our religion. In addition he ought to be able to discern the moral character of the environments of life, to know not only what to accept and what to reject, but how to warn his less instructed brethren.

Concerning whom - The apostle here begins an important digression, wherein he reproves, admonishes, and exhorts the Hebrews. We - Preachers of the gospel. Have many things to say, and hard to be explained - Though not so much from the subject - matter, as from your slothfulness in considering, and dulness in apprehending, the things of God.