Very often I've read people complain that we can not understand God with "mere human reason". I think the following quote addresses this misunderstanding quite well:
Of course, the Scripture says that God’s thoughts are not our thoughts and his ways are not our ways. But is it good exegesis to say that this means his logic, his arithmetic, his truth are not ours? If this were so, what would the consequences be? It would mean not only that our additions and subtractions are all wrong, but also that all our thoughts, in history as well as in arithmetic, are all wrong. If, for example, we think that David was King of Israel, and God’s thoughts are not ours, then it follows that God does not think David was King of Israel. David in God’s mind was perchance Prime Minister of Babylon.
–Gordon Clark: An Introduction to Christian Philosophy, “The Axiom of Revelation” (Trinity Foundation, 2004)