‘Why do we believe stuff that’s not true?’ he said, and I said, ‘because it’s easier than admitting we don’t know. Which is a lot closer to reality. That’s what we humans do, we make up things about everything. There’s very little we really know, so we make it up and then believe it, until reality clearly tells us that our theories aren’t working any more. Then we go and make up something new and start the whole game all over again.’
I came across the above on Facebook, and had trouble initially tracking down the source. But apparently it is from Brian Andreas’ book Theories of Everything.