“Liberty means responsibility. That is why most men dread it.”

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself.

A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

You see things; you say, 'Why?' But I dream things that never were; and I say, 'Why not?'

Life is no brief candle to me. It is a sort of splendid torch which I have got a hold of for the moment.

If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.

Beware of false knowledge; it is more dangerous than ignorance.