16 Come, brethren, give me your whole attention. But first of all consider what it is that I promise; if haply I can find any resemblance in the creature, for the Creator is too high above us. And perhaps some one of us, whose mind the glare of truth has, as it were, stricken with sparks of its brightness, can say those words, “I said in my ecstasy.”— What did you say in your ecstasy?— “I am cast away from the sight of Your eyes.” For it seems to me as if he who said this had lifted up his soul unto God, and had been carried beyond himself, while they said daily unto him, “Where is your God?”— had reached by a kind of spiritual contact to that unchangeable Light, and through the weakness of his sight had been unable to endure it, and so had fallen back again into his own, as it were, sick and languid state, and had compared himself with that Light, and had felt that the eye of his mind could not yet be attempered to the light of God's wisdom.
And because he had done this in ecstasy, hurried away from his bodily senses, and taken up into God, when he was recalled in a manner from God to man, he said, “I said in my ecstasy.” For I saw in ecstasy I know not what, which I could not long endure, and being restored to my mortal estate, and the manifold thoughts of mortal things from the body which presses down the soul, I said, what? “I am cast away from the sight of Your eyes.” You are far above, and I am far below. What then, brethren, shall we say of God?
For if you have been able to comprehend what you would say, it is not God; if you have been able to comprehend it, you have comprehended something else instead of God. If you have been able to comprehend Him as you think, by so thinking you have deceived yourself. This then is not God, if you have comprehended it; but if it be God, you have not comprehended it. How therefore would you speak of that which you can not comprehend?
Source: Sermons on Selected Lessons of the New Testament (New Advent)