What then, brethren, shall we say of God? For if you have been able to comprehend what you wanted to 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 is God, you have not comprehended it. How therefore would you speak of that which you cannot comprehend?
How do you know if you are thinking and speaking rightly of God? In short, when you know that you do not know what you are thinking and talking about. Is knowing God possible? Yes, but only in the sense that He may be apprehended, but never comprehended.