Said the very entertaining Scott Adams.
ADDED: From another recent post (with a fascinating chart):
... I don’t believe our brains evolved to give us truth. Our brains evolved to create little movies in which we get to be the stars. And we can view our movies through many filters with no preference for which filter is the “right” one.That can't be true... by its own terms. But, boy, does it feel true! And, therefore, it's... true/not true.
For example, Ted Cruz and Richard Dawkins believe totally different things about reality and yet both can use an ATM, shop at a store, and procreate. So your filter on reality need not be related to any actual underlying reality in order to keep you alive. It just has to NOT kill you.