Matthew 24:33-34.
“Now learn a parable of the fig tree; when his branch is yet tender, and puts forth leaves, you know that summer is near: so likewise ye, when you shall see all these things, know that it is near, even at the doors.”
Forasmuch as He had said, “Immediately after the tribulation of those days;” but they sought of this, after how long a time it should be, and desired to know in particular the very day, therefore He puts also the similitude of the fig tree, indicating that the interval was not great, but that in quick succession would occur His advent also. And this He declared not by the parable alone, but by the words that follow, saying, “know that it is near, even at the doors.”
Whereby He foretells another thing also, a spiritual summer, and a calm that should be on that day (after the present tempest) for the righteous; but to the sinners the contrary, winter after summer, which He declares in what follows, saying, that the day shall come upon them, when they are living in luxury.
But not for this intent only did He put forward this about the fig tree, in order to declare the interval; for it was possible to have set this before them in other ways as well; but that he might hereby also confirm His saying, as assuredly thus to come to pass. For as this of the fig tree is of necessity, so that too. For thus, wherever He is minded to speak of that which will assuredly come to pass, He brings forward the necessary courses of nature, both Himself, and the blessed Paul imitating Him. Therefore also when speaking of His resurrection, He says, “When the grain of wheat has fallen into the earth, except it die, it abides alone; but if it die, it brings forth much fruit.” Whereby also the blessed Paul being instructed uses the same similitude, “You fool,” he says, “that which you sow is not quickened, except it die.”
After this, that they might not straightway return to it again, and say, “When?” he brings to their remembrance the things that had been said, saying, “Verily I say unto you, This generation shall not pass, till all these things be fulfilled!” All these things. What things? I pray you. Those about Jerusalem, those about the wars, about the famines, about the pestilences, about the earthquakes, about the false Christs, about the false prophets, about the sowing of the gospel everywhere, the seditions, the tumults, all the other things, which we said were to occur until His coming. How then, one may ask, did He say, “This generation?” Speaking not of the generation then living, but of that of the believers. For He is wont to distinguish a generation not by times only, but also by the mode of religious service, and practice; as when He says, “This is the generation of them that seek the Lord.”
For what He said above, “All these must come to pass,” and again, “the gospel shall be preached,” this He declares here also, saying, All these things shall surely come to pass, and the generation of the faithful shall remain, cut off by none of the things that have been mentioned. For both Jerusalem shall perish, and the more part of the Jews shall be destroyed, but over this generation shall nothing prevail, not famine, not pestilence, not earthquake, nor the tumults of wars, not false Christs, not false prophets, not deceivers, not traitors, not those that cause to offend, not the false brethren, nor any other such like temptation whatever.
Then to lead them on more in faith, He says, “Heaven and earth shall pass away, but my words shall not pass away;” that is, it were more easy for these firm, fixed, and immoveable bodies to be blotted out, than for ought of my words to fall to the ground. And he who gainsays these things, let him test His sayings, and when he has found them true (for so he surely will find them) from what is past, let him believe also the things to come, and let him search out all things with diligence, and he will see the actual events bearing witness to the truth of the prophecy. And the elements He has brought forward, at once to declare, that the church is of more honor than Heaven and earth, and at the same time to indicate Himself by this also to be maker of all. For since He was speaking of the end, a thing disbelieved by many, He brought forward Heaven and earth, indicating His unspeakable power, and showing with great authority, that He is Lord of all, and by these things rendering His sayings deserving of credit, even with those who are much given to doubt.
“But of that day and hour knows no man, no, not the angels of Heaven, neither the Son, but the Father.” By saying, not the angels, He stopped their mouths, that they should not seek to learn what these angels know not; and by saying, “neither the Son,” forbids them not only to learn, but even to inquire. For in proof that therefore He said this, see after His resurrection, when He saw they had become over curious, how He stopped their mouths more decidedly. For now indeed He has mentioned infallible signs, many and endless; but then He says merely, “It is not for you to know times or seasons.” And then that they might not say, we are driven to perplexity, we are utterly scorned, we are not held worthy so much as of this, He says, “which the Father has put in His own power.” And this, because He was exceedingly careful to honor them, and to conceal nothing from them. Therefore He refers it to His Father, both to make the thing awful, and to exclude that of which He had spoken from their inquiry. Since if it be not this, but He is ignorant of it, when will He know it? Will it be together with us? But who would say this? And the Father He knows clearly, even as clearly as He knows the Son; and of the day is He ignorant? Moreover, “the Spirit indeed searches even the deep things of God,” and does not He know so much as the time of the judgment? But how He ought to judge He knows, and of the secrets of each He has a full perception; and what is far more common than that, of this could He be ignorant? And how, if “all things were made by Him, and without Him was not even one thing made,” was He ignorant of the day? For He who made the worlds, it is quite plain that He made the times also; and if the times, even that day. How then is He ignorant of that which He made?
Source: Homilies on the Gospel of St. Matthew (New Advent)