Pyramids (Discworld, #7)

by Terry Pratchett

Perhaps, he thought, there is life somewhere else. On the stars, maybe. If it’s true that there are billions of universes stacked alongside one another, the thickness of a thought apart, then there must be people elsewhere. But wherever they are, no matter how mightily they try, no matter how magnificent the effort, they surely can’t manage to be as godawfully stupid as us. I mean, we work at it. We were given a spark of it to start with, but over hundreds of thousands of years we’ve really improved on it.

And Dil was realizing that there are few things that so shake belief as seeing, clearly and precisely, the object of that belief. Seeing, contrary to popular wisdom, isn’t believing. It’s where belief stops, because it isn’t needed anymore.