
Can the human mind ever truly know God? Let's put that question aside for a moment and focus upon another closely related one, can we ever truly know another person? Let's say you met Frank yesterday, Frank had long hair, a wife, and he mentioned he was afraid of heights. You take in all these things and create a mental image of Frank, now you know him. The problem is, earlier today Frank got a haircut, a divorce, and he overcame his fear of heights during a skydiving trip. He had quite a busy morning, but this all happened without you knowing, and your mental image of Frank remains the same. What you think you know about Frank, quite frankly, has nothing to do with him anymore. This is one of the issues with knowledge, it's inherently limited and based in the past. You can't know everything that's happening in every moment, and you can't know everything that's going on in another person's inner world. Most people have enough trouble keeping track of everything going on in their own inner world.
People change, they're dynamic living beings, very difficult to know with any certainty, and yet people believe they can know God with certainty? A truly noble quest! For those who choose it, I wish you luck, but in the interest of saving you some trouble I'm going to say right now it's ultimately futile. God is the Eternal Mystery, the Unknowable, the "I Am", not the "I known". There's belief systems that have spent thousands of years attempting to know God, and they're no closer now than when they began. A few even seem to be further away, the belief systems grow more and more complicated, and instead of finding any clarity they just create more confusion.