John 2:22

Many such sayings He utters which were not intelligible to His immediate hearers, but which were to be so to those that should come after. And wherefore doth He this? In order that when the accomplishment of His prediction should have come to pass, He might be seen to have foreknown from the beginning what was to follow; which indeed was the case with this prophecy. For, saith the Evangelist, "When He was risen from the dead, His disciples remembered that He had said this; and they believed the Scripture, and the word which Jesus had said."

The question still remains, "How was it that the disciples did not know that He must rise from the dead?" It was, because they had not been vouchsafed the gift of the Spirit; and therefore, though they constantly heard His discourses concerning the Resurrection, they understood them not, but reasoned with themselves what this might be. For very strange and paradoxical was the assertion that one could raise himself, and would raise himself in such wise. And so Peter was rebuked, when, knowing nothing about the Resurrection, he said, "Be it far from Thee." And Christ did not reveal it clearly to them before the event, that they might not be offended at the very outset, being led to distrust His words on account of the great improbability of the thing, and because they did not yet clearly know Him, who He was. For no one could help believing what was proclaimed aloud by facts, while some would probably disbelieve what was told to them in words. Therefore He at first allowed the meaning of His words to be concealed; but when by their experience He had verified His sayings, He after that gave them understanding of His words, and such gifts of the Spirit that they received them all at once. "He," saith Jesus, "shall bring all things to your remembrance." For they who in a single night cast off all respect for Him, and fled from and denied that they even knew Him, would scarcely have remembered what He had done and said during the whole time, unless they had enjoyed much grace of the Spirit.

"But," says one, "if they were to hear from the Spirit, why needed they to accompany Christ when they would not retain His words?" Because the Spirit taught them not, but called to their mind what Christ had said before; and it contributes not a little to the glory of Christ, that they were referred to the remembrance of the words He had spoken to them. At the first then it was of the gift of God that the grace of the Spirit lighted upon them so largely and abundantly; but after that, it was of their own virtue that they retained the Gift. For they displayed a shining life, and much wisdom, and great labors, and despised this present life, and thought nothing of earthly things, but were above them all; and like a sort of light-winged eagle, soaring high by their works, reached to heaven itself, and by these possessed the unspeakable grace of the Spirit.

For before the resurrection they did not understand the Scriptures, because they had not yet received the Holy Ghost, Who was not yet given, because Jesus was not yet glorified. (John 7:39) But on the day of the resurrection our Lord appeared and opened their meaning to His disciples; that they might understand what was said of Him in the Law and the Prophets. And then they believed the prediction of the Prophets that Christ would rise the third day, and the word which Jesus had spoken to them: Destroy this temple, &c.