4 But truly there have been some philosophers of this world who have sought for the Creator by means of the creature; for He can be found by means of the creature, as the apostle plainly says, “For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, even His eternal power and glory; so they are without excuse.” And it follows, “Because that, when they knew God;” he did not say, Because they did not know, but “Because that, when they knew God, they glorified Him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.”
How darkened? It follows, when he says more plainly: “Professing themselves to be wise, they became fools.” They saw whither they must come; but ungrateful to Him who afforded them what they saw, they wished to ascribe to themselves what they saw; and having become proud, they lost what they saw, and were turned from it to idols and images, and to the worship of demons, to adore the creature and to despise the Creator. But these having been blinded did those things, and became proud, that they might be blinded: when they were proud they said that they were wise.
Those, therefore, concerning whom he said, “Who, when they had known God,” saw this which John says, that by the Word of God all things were made. For these things are also found in the books of the philosophers: and that God has an only-begotten Son, by whom are all things. They were able to see that which is, but they saw it from afar: they were unwilling to hold the lowliness of Christ, in which ship they might have arrived in safety at that which they were able to see from afar and the cross of Christ appeared vile to them.
The sea has to be crossed, and do you despise the wood? Oh, proud wisdom! You laugh to scorn the crucified Christ; it is He whom you see from afar: “In the beginning was the Word, and the Word was with God.” But wherefore was He crucified? Because the wood of His humiliation was needful to you. For you had become swollen with pride, and had been cast out far from that fatherland; and by the waves of this world has the way been intercepted, and there is no means of passing to the fatherland unless borne by the wood.
Ungrateful one! You laugh Him to scorn who has come to you that you may return: He has become the way, and that through the sea: thence He walked in the sea to show that there is a way in the sea. But you who are not able in any way yourself to walk in the sea, be carried in a ship, be carried by the wood: believe in the crucified One, and you shall arrive there. On account of you He was crucified, to teach you humility; and because if He should come as God, He would not be recognized. For if He should come as God, He would not come to those who were not able to see God. For not according to His Godhead does He either come or depart; since He is everywhere present, and is contained in no place. But, according to what did He come? He appeared as a man.
Source: Tractates on the Gospel of John (New Advent)