16 Next we come to the passage where His brethren— that is to say, His relations according to the flesh— urge Him to go up to the feast-day, in order that He may have an opportunity of making Himself known to the multitude. And here, again, how supremely elevated is the tone of His reply! “My time is not yet come, but your time is always ready. The world cannot hate you; but me it hates, because I testify of it that the works thereof are evil.” So it is the case, then, that “your time is always ready,” because ye desire that kind of day to which the prophet refers when he says, “But I have not laboured following You, O Lord; and the day of man I have not desired, You know:” that is to say, to soar to the light of the Word, and to desire that day which Abraham desired to see, and which he saw, and was glad. And again, how wonderful, how divine, how sublime are the words which John represents Him to have spoken after He had gone up to the temple, at the time of the feast!
They are such as these: that where He was about to go, there they could not come; that they both knew Him, and knew whence He was; that He who sent Him is true, whom they knew not, which is much the same as if He had said, “You both know whence I am, and know not whence I am.” And what else did He wish to be understood by such utterances, but that it was possible for Him to be known to them according to the flesh, in respect of lineage and country, but that, so far as regarded His divinity, He was unknown to them? On this occasion, too, when He spoke of the gift of the Holy Spirit, He showed them who He was, inasmuch as He could hold the power of bestowing that highest boon.
Source: The Harmony of the Gospels (New Advent)