4 “And now,” He adds, “I am no more in the world, and these are in the world.” If your thoughts turn to the very hour in which He was speaking, both were still in the world; to wit, He Himself, and those of whom He was so speaking: for it is not in respect of the tendency of heart and life that we can or ought to understand it, so that they should be described as still in the world, on the ground that they still savored of the earthly; and that He was no longer in the world, because divine in the disposition of His mind.
For there is one word used here, which makes any such understanding altogether inadmissible; because He does not say, And I am not in the world; but, “I am no more in the world:” thereby showing that He Himself had been in the world, but was no more so. And are we then at liberty to believe that He at one time savored of the worldly, and, delivered at length from such a mistake, no longer retained the old disposition? Who would venture to shut himself up in so profane a meaning.
It remains, therefore, that in the same sense in which He Himself also was previously in the world, He declared that He was no longer in the world, that is to say, in His bodily presence; in other words, showing thereby that His own absence from the world was now in the immediate future, and theirs later, when He said that He was no longer here, and that they were so, although both He and they were still present. For He thus spoke, as a man in harmony with men, in accordance with the prevailing custom of human speech.
Do we not say every day, he is no longer here, of one who is on the very point of departure? And such in particular is the way we are wont to speak of those who are at the point of death. And besides all else, the Lord Himself, as if foreseeing the thoughts that might possibly be excited in those who were afterwards to read these words, added, “And I come to You:” explaining thereby in some measure why He said, “I am no more in the world.”
Source: Tractates on the Gospel of John (New Advent)