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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.