John 13:31
“Now is the Son of Man glorified.”
In this way rousing the dejected thoughts of the disciples, and persuading them not only not to despond, but even to rejoice. On this account He rebuked Peter at the first, because for one who has been in death to overcome death, is great glory. And this is what He said of Himself, “When I am lifted up, then you shall know that I Am”; and again, “Destroy this Temple”; and again, “No sign shall be given unto you but the sign of Jonas.” For how can it be otherwise than great glory, the being able even after death to do greater things than before death? For in order that the Resurrection might be believed, the disciples did work greater things. But unless He had lived, and had been God, how could these men have wrought such things in His Name?
Ver. 32. “And God shall glorify Him.”
What is, “And God shall glorify Him in Himself”? It is “by means of Himself, not by means of another.”
“And shall straightway glorify Him.”
4. That is, “simultaneously with the Cross.” “For it will not be after much time,” He says, “nor will He wait for the distant season of the Resurrection, nor will He then show Him glorious, but straightway on the Cross itself His glories shall appear.” And so the sun was darkened, the rocks rent; the veil of the temple was parted asunder, many bodies of saints that slept arose, the tomb had its seals, the guards sat by, and while a stone lay over the Body the Body rose; forty days passed by, and the Gift of the Spirit came, and they all straightway preached Him. This is, “shall glorify Him in Himself, and shall straightway glorify Him”; not by Angels or Archangels, not by any other power, but by Himself. But how did He also glorify Him by Himself? By doing all for the glory of the Son. Yet the Son did all. Do you see that He referrs to the Father the things done by Himself?
Ver. 33. “Little children, yet a little while I am with you— and as I said unto the Jews, Whither I go ye cannot come, so now I say to you.”
He now begins words of sorrow after the supper. For when Judas went forth it was no longer evening, but night. But since they were about to come shortly, it was necessary to set all things before the disciples, that they might have them in remembrance; or rather, the Spirit recalled all to their minds. For it is likely that they would forget many things, as hearing for the first time, and being about to undergo such temptations. Men who were weighed down to sleep, (as another Evangelist says,) who were possessed by despondency, as Christ says Himself, “Because I have said these things unto you, sorrow has filled your hearts”, how could they retain all these things exactly? Why then were they spoken? It became no little gain to them with respect to their opinion of Christ, that in after times when reminded they certainly knew that they had long ago heard these things from Christ. But wherefore does He first cast down their souls, saying, “Yet a little while I am with you”? “To the Jews indeed it was said with reason, but why do You place us in just the same class with those obstinate ones?” He by no means did so. “Why then said He, 'As I said to the Jews'?” He reminded them that He did not now, because troubles were upon them, warn them of these things, but that He had foreknown them from the first, and that they were witnesses who had heard that He had said these things to the Jews. Wherefore He added also the word, “little children,” that when they heard, “As I said to the Jews,” they might not deem that the expression was used in like sense towards themselves. It was not then to depress but to comfort them that He thus spoke, that their dangers might not, by coming upon them suddenly, trouble them to excess.
“Whither I go, you cannot come.” He shows that His death is a removal, and a change for the better to a place which admits not corruptible bodies. This He says, both to excite their love towards Him, and to make it more fervent. You know that when we see any of our dearest friends departing from us, our affection is warmest, and the more so, when we see them going to a place to which it is not even possible for us to go. These things then He said, terrifying the Jews, but kindling longing in the disciples. “Such is the place, that not only not they, but not even you, My best beloved, can come there.” Here He shows also His Own dignity.
“So now I say to you.” Why “now”? “In one way to them, to you in another way”; that is, “not with them.” But when did the Jews seek Him, when the disciples? The disciples, when they fled the Jews, when they suffered miseries unendurable and surpassing all description at the capture of their city, when the wrath of God was borne down upon them from every side. To the Jews therefore He spoke then, because of their unbelief, “but to you now, that troubles might not come upon you unexpected.”
Ver. 34. “A new commandment I give unto you.”
For since it was likely that they would be troubled when they heard these things, as though they were about to be deserted, He comforts them, investing them with that which was the root of all blessings and a safeguard, love. As though He had said, “Grieve ye at My departure? Nay, if you love one another, you shall be the stronger.” Why then said He not this? Because He said what profited them more than this.
Ver. 35. “By this shall all men know that you are My disciples.”
5. By this He at the same time showed that the company should never be extinguished, when He gave them a distinguishing token. This He said when the traitor was cut off from them. But how calls He that a new commandment which is contained also in the Old (covenant)? He made it new Himself by the manner; therefore He added, “As I have loved you.” “I have not paid back to you a debt of good deeds first done by you, but Myself have begun,” He says. “And so ought you to benefit your dearest ones, though you owe them nothing”; and omitting to speak of the miracles which they should do, He makes their characteristic, love. And why? Because it is this which chiefly shows men holy; it is the foundation of all virtue; by this mostly we are all even saved. For “this,” He says, “is to be a disciple; so shall all men praise you, when they see you imitating My Love.” What then? Do not miracles much more show this? By no means. For “many will say, Lord, have we not in Your Name cast out devils?” And again, when they rejoice that the devils obey them, He says, “Rejoice not that the devils obey you, but that your names are written in heaven.” And this indeed brought over the world, because that was before it; had not that been, neither would this have endured. This then straightway made them perfect, the having all one heart and one soul. But had they separated one from the other, all things would have been lost.
Source: Homilies on the Gospel of John (New Advent)