,' we have learned from the blessed Paul, when he gives the title of Light unapproachable  ' to the God over all, and by the addition defines and teaches us the transcendent superiority of His Light; and now that we have learnt that there is so great a difference between the one Light and the other, we shall not patiently endure so much as the mere mention of the notion that the conception of light in either case is one and the same." Can he be serious when he advances such arguments in his attempts against the truth, or is he experimenting upon the dulness of those who follow his error to see whether they can detect so childish and transparent a fallacy, or have no sense to discern such a barefaced imposition? For I suppose that no one is so senseless as not to perceive the juggling with equivocal terms by which Eunomius deludes both himself and his admirers. The disciples, he says, were termed light, and that which was produced in the course of creation is also called light. But who does not know that in these only the name is common, and the thing meant in each case is quite different? For the light of the sun gives discernment to the sight, but the word of the disciples implants in men's souls the illumination of the truth. If, then, he is aware of this difference even in the case of that light, so that he thinks the light of the body is one thing, and the light of the soul another, we need no longer discuss the point with him, since his defence itself condemns him if we hold our peace. But if in that light he cannot discover such a difference as regards the mode of operation, (for it is not, he may say, the light of the eyes that illumines the flesh, and the spiritual light which illumines the soul, but the operation and the potency of the one light and of the other is the same, operating in the same sphere and on the same objects,) then how is it that from the difference between the light of the beams of the sun and that of the words of the Apostles, he infers a like difference between the Only-begotten Light and the Light of the Father? "But the Son," he says, "is called the true' Light, the Father Light unapproachable.'" Well, these additional distinctions import a difference in degree only, and not in kind, between the light of the Son and the light of the Father. He thinks that the "true" is one thing, and the "unapproachable" another. I suppose there is no one so idiotic as not to see the real identity of meaning in the two terms. For the "true" and the "unapproachable" are each of them removed in an equally absolute degree from their contraries. For as the "true" does not admit any intermixture of the false, even so the "unapproachable" does not admit the access of its contrary. For the "unapproachable" is surely unapproachable by evil. But the light of the Son is not evil; for how can any one see in evil that which is true? Since, then, the truth is not evil, no one can say that the light which is in the Father is unapproachable by the truth. For if it were to reject the truth it would of course be associated with falsehood. For the nature of contradictories is such that the absence of the better involves the presence of its opposite. If, then, any one were to say that the Light of the Father was contemplated as remote from the presentation of its opposite, he would interpret the term "unapproachable" in a manner agreeable to the intention of the Apostle. But if he were to say that "unapproachable" signified alienation from good, he would suppose nothing else than that God was alien from, and at enmity with, Himself, being at the same time good and opposed to good. But this is impossible: for the good is akin to good. Accordingly the one Light is not divergent from the other. For the Son is the true Light, and the Father is Light unapproachable. In fact I would make bold to say that the man who should interchange the two attributes would not be wrong. For the true is unapproachable by the false, and on the other side, the unapproachable is found to be in unsullied truth. Accordingly the unapproachable is identical with the true, because that which is signified by each expression is equally inaccessible to evil. What is the difference then, that is imagined to exist in these by him who imposes on himself and his followers by the equivocal use of the term "Light"? But let us not pass over this point either without notice, that it is only after garbling the Apostle's words to suit his own fancy that he cites the phrase as if it came from him. For Paul says, "dwelling in light unapproachable  ." But there is a great difference between being oneself something and being in something. For he who said, "dwelling in light unapproachable," did not, by the word "dwelling," indicate God Himself, but that which surrounds Him, which in our view is equivalent to the Gospel phrase which tells us that the Father is in the Son. For the Son is true Light, and the truth is unapproachable by falsehood; so then the Son is Light unapproachable in which the Father dwells, or in Whom the Father is.