How do you know?

"The stories [my grandmother:] tells are quite vivid. If I didn't know better, I'd believe every word she said. I, and other family members, sometimes feel the need to bring her back to reality, but most of the time, we realize that it's futile to try. I'm not suggesting that your mental condition is comparable to a 72 year old woman with Alzheimer's (I would never insult my Grandmother like that), but when you, or anyone else, claims to 'know God', I can only assume that you're in a state of ha