4 And then, when He had so said, “He charged them that they should tell no man that He was the Christ.”
And why did He charge them? That when the things which offend are taken out of the way, and the cross is accomplished, and the rest of His sufferings fulfilled, and when there is nothing any more to interrupt and disturb the faith of the people in Him, the right opinion concerning Him may be engraven pure and immovable in the mind of the hearers. For, in truth, His power had not yet clearly shone forth. Accordingly it was His will then to be preached by them, when both the plain truth of the facts, and the power of His deeds were pleading in support of the assertions of the apostles. For it was by no means the same thing to see Him in Palestine, now working miracles, and now insulted and persecuted (and especially when the very cross was presently to follow the miracles that were happening); and to behold him everywhere in the world, adored and believed, and no more suffering anything, such as He had suffered.
Therefore He bids them “tell no man.” For that which has been once rooted and then plucked up, would hardly, if planted, again be retained among the many; but that which, once fixed, has remained immovable, and has suffered injury from no quarter, easily mounts up, and advances to a greater growth.
And if they who had enjoyed the benefit of many miracles, and had had part in so many unutterable mysteries, were offended by the mere hearing of it; or rather not these only, but even the leader of them all, Peter; consider what it was likely the common sort should feel, being first told that He is the Son of God, then seeing Him even crucified and spit upon, and that without knowledge of the secret of those mysteries, or participation in the gift of the Holy Ghost. For if to His disciples He said, “I have many things to say unto you, but you cannot bear them now;” much more would the rest of the people have utterly failed, had the chiefest of these mysteries been revealed to them before the proper time. Accordingly He forbids them to tell.
And to instruct you how great a thing it was, their afterwards learning His doctrine complete, when the things that offend had passed by; learn it from this same leader of theirs. For this very Peter, he who after so many miracles proved so weak as even to deny Him, and to be in fear of a mean damsel; after the cross had come forth, and he had received the certain proofs of the resurrection, and there was nothing more to offend and trouble him, retained the teaching of the Spirit so immovable, that more vehemently than a lion he sprang upon the people of the Jews, for all the dangers and innumerable deaths which were threatened.
With reason then did He bid them not tell the many before the crucifixion, since not even to them that were to teach did He venture to commit all before the crucifixion. “For I have many things to say unto you,” says He, “but you cannot bear them now.”
And of the things too that He did say, they do not understand many, which He did not make plain before the crucifixion. At least when He was risen from the dead, then and not before they knew some of His sayings.
5. “From that time forth began He to show unto them that He must suffer. From that time.” What time? When He had fixed the doctrine in them; when He had brought in the beginning of the Gentiles.
But not even so did they understand what He said. “For the saying,” it is said, “was hid from them;” and they were as in a kind of perplexity, not knowing that He must rise again. Therefore He rather dwells on the difficulties, and enlarges His discourse, that He may open their mind, and they may understand what it can be that He speaks of.
“But they understood not, but the saying was hid from them, and they feared to ask this;” not whether He should die, but how, and in what manner, and what this mystery could be. For they did not even know what was this same rising again, and supposed it much better not to die. Therefore, the rest being troubled and in perplexity, Peter again, in his ardor, alone ventures to discourse of these things; and not even he openly, but when he had taken Him apart; that is, having separated himself from the rest of the disciples; and he says, “Be it far from You, Lord, this shall not be unto You.” What ever is this? He that obtained a revelation, he that was blessed, has he so soon fallen away, and suffered overthrow, so as to fear His passion? And what marvel, that one who had not on these points received any revelation, should have that feeling? Yea, to inform you that not of himself did he speak those other things either, see in these matters that were not revealed to him how he is confounded and overthrown, and being told ten thousand times, knows not what the saying can mean.
For that He is Son of God he had learned, but what the mystery of the cross and of the resurrection might be, was not yet manifest to him: for “the saying,” it is said, “was hid from them.”
Do you see that with just cause He bade them not declare it to the rest? For if it so confounded them, who must needs be made aware of it, what would not all others have felt?
Source: Homilies on the Gospel of St. Matthew (New Advent)