Every really new idea looks crazy at first.
The important thing is never to stop questioning.
If you want to make enemies, try to change something.
As I grow older, I pay less attention to what men say. I just watch what they do.
Too bad all the people who know how to run this country are busy running taxicabs or cutting hair.
Doubt is not a pleasant condition, but certainty is absurd.
The person who has no opinion will seldom be wrong.