After that last post, I realize that there is a difference between what we discover and what God chooses to reveal to us. Left on our own, we simply find out more and more, through science mostly, about things that already exist. We would never have known that God is in three Persons, that he is love, that he had planned to save us... for these could only have been revealed by him directly to us. Therefore, we must take all such revealed truths to heart and treasure them.
In conclusion, we cannot know God if he does not say anything. But if he does, then we'd better listen and hold onto everything he says, for this is the only way for us to know him.