John 1:9

(Hom. 2, in div. loc.) Or thus: We must not understand the words, lighteneth every man that cometh into the world, of the growth from hidden seeds to organized bodies, but of the entrance into the invisible world, by the spiritual regeneration and grace, which is given in Baptism. Those then the true Light lighteneth, who come into the world of goodness, not those who rush into the world of sin.

"That was the true Light, which lighteth every man that cometh into the world." For since above in speaking of John he said, that he came "to bear witness of that Light"; and that he was sent in these our days; lest any one at hearing this should, on account of the recent coming of the witness, conceive some like suspicion concerning Him, who is witnessed of, he has carried up the imagination, and transported it to that existence which is before all beginning, which has neither end nor commencement.

You have heard that "That was the true Light": why are you vainly and rashly striving to overshoot by force of reasoning this Life which is unlimited? You cannot do it. Why seek what may not be sought? Why be curious about what is incomprehensible? Why search what is unsearchable? Gaze upon the very source of the sunbeams. You cannot; yet you are neither vexed nor impatient at your weakness; how then have you become so daring and headlong in greater matters? The son of thunder, John who sounds the spiritual trumpet, when he had heard from the Spirit the "was", enquired no farther. And are you, who share not in his grace, but speak from your own wretched reasonings, ambitious to exceed the measure of his knowledge? Then for this very reason you will never be able even to reach to the measure of his knowledge.

Let us not then remove the eternal bounds which our fathers set, but let us ever yield to the laws of the Spirit; and when we hear that "That was the true Light," let us seek to discover nothing more. For it is not possible to pass beyond this saying. Had His generation been like that of a man, needs must there have been an interval between the begetter and the begotten; but since it is in a manner ineffable and becoming God, give up the "before" and the "after," for these are the names of points in time, but the Son is the Creator even of all ages.

"Then," says one, "He is not Father, but brother." What need, pray? If we had asserted that the Father and the Son were from a different root, you might have then spoken this well. But, if we flee this impiety, and say the Father, besides being without beginning, is Unbegotten also, while the Son, though without beginning, is Begotten of the Father, what kind of need that as a consequence of this idea, that unholy assertion should be introduced? None at all. For He is an Effulgence: but an effulgence is included in the idea of the nature whose effulgence it is. For this reason Paul has called Him so, that you may imagine no interval between the Father and the Son. This expression therefore is declaratory of the point; but the following part of the proof quoted, corrects an erroneous opinion which might beset simple men. For, says the Apostle, do not, because you have heard that he is an Effulgence, suppose that He is deprived of His proper person; this is impious, and belongs to the madness of the Sabellians, and of Marcellus' followers. We say not so, but that He is also in His proper Person. And for this reason, after having called Him "Effulgence," Paul has added that He is "the express image of His Person," in order to make evident His proper Personality, and that He belongs to the same Essence of which He is also the express image.