8 Do you see then that as I said, he has not been silent as to the Father in his words concerning the Son? And if these instances are not sufficient fully to explain the whole matter, marvel not, for our argument is God, whom it is impossible to describe, or to imagine worthily; hence this man nowhere assigns the name of His essence, (for it is not possible to say what God is, as to essence,) but everywhere he declares Him to us by His workings. For this “Word” one may see shortly after called “Light,” and the “Light” in turn named “Life.”
Although not for this reason only did he so name Him; this was the first reason, and the second was because He was about to declare to us the things of the Father. For “all things,” He says, “that I have heard from my Father, I have made known unto you.” He calls Him both “Light” and “Life,” for He has freely given to us the light which proceeds from knowledge, and the life which follows it. In short, one name is not sufficient, nor two, nor three, nor more, to teach us what belongs to God. But we must be content to be able even by means of many to apprehend, though but obscurely, His attributes.
And he has not called Him simply “Word,” but with the addition of the article, distinguishing Him from the rest in this way also. Do you see then that I said not without cause that this Evangelist speaks to us from heaven? Only see from the very beginning whither he has drawn up the soul, having given it wings, and has carried up with him the mind of his hearers. For having set it higher than all the things of sense, than earth, than sea, than heaven, he leads it by the hand above the very angels, above cherubim and seraphim, above thrones and principalities and powers; in a word, persuades it to journey beyond all created things.
Source: Homilies on the Gospel of John (New Advent)