Galileo Galilei quotes
I have never met a man so ignorant that I couldn't learn something from him. 
I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use. 
All truths are easy to understand once they are discovered; the point is to discover them. 
The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do. 