[gowld]

Can you prove Dick's statement is true? Denying reality is a very powerful trick. Any unavoidable physical consequence inside reality can be ignored by a sufficiently aversive mind.

Consider the differences between these claims:

"My reality is that which, when you stop believing in it, doesn't go away."

"Your reality is that which, when you stop believing in it, doesn't go away."

and bonus:

"Fantasy is that which, no matter how much you believe in it, doesn't come to be."