There are things we know for certain."
"Oh? Name one."
"The sun's going to come up tomorrow morning."
"Why?"
"It always has."
"Does that really mean that it always will?"
A faint look of consternation crossed her face. "It will, won't it?"
"Probably, but we can't be absolutely certain. Once you've decided that something's absolutely true, you've closed your mind on it, and a closed mind doesn't go anywhere. Question everything, Pol. That's what education's all about.

Autore: David Eddings