Read this: Albertus Magnus championed the idea, drawn from Dionysus, that positive knowledge of God is possible, but obscure. Thus, it is easier to state what God is not, than to state what God is: "... we affirm things of God only relatively, that is, casually, whereas we deny things of God absolutely, that is, with reference to what He is in Himself. And there is no contradiction between a relative affirmation and an absolute negation. It is not contradictory to say that someone is white-toothed and not white".
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): How do we deny things of God?
absolutely