To be able to "see" or understand God, humility is absolutely necessary. It's like having the right password when you want to get on a website. Otherwise, you can have eyes but still do not see; a mind but still do not comprehend. That's why many who possess knowledge of the world and/or want to be masters on their own do not let themselves go; instead they keep doubting, questioning... and never get to know or come closer to God. They make it hard for themselves.