Continuous effort - not strength or intelligence - is the key to unlocking our potential.Winston Churchill
I'm sure the universe is full of intelligent life. It's just been too intelligent to come here.Arthur C. Clarke
If we take the generally accepted definition of bravery as a quality which knows no fear, I have never seen a brave man. All men are frightened. The more intelligent they are, the more they are frightened.George S. Patton
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.Bertrand Russell
A woman who thinks she is intelligent demands the same rights as man. An intelligent woman gives up.Sidonie Gabrielle Colette
I won't insult your intelligence by suggesting that you really believe what you just said.William F. Buckley, Jr.
Cynical realism is the intelligent man's best excuse for doing nothing in an intolerable situation.Aldous Huxley
All intelligent thoughts have already been thought, what is necessary is only to try to think them again.Johann Wolfgang von Goethe