Continuous effort - not strength or intelligence - is the key to unlocking our potential.

Happiness in intelligent people is the rarest thing I know.

Creativity is intelligence having fun.

The difference between stupidity and genius is that genius has its limits.

Military intelligence is a contradiction in terms.

Intelligence without ambition is a bird without wings.

I'm sure the universe is full of intelligent life. It's just been too intelligent to come here.

Genius without education is like silver in the mine.

A woman uses her intelligence to find reasons to support her intuition.

Discipline is the mark of intelligent living

Intelligence is quickness in seeing things as they are.

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.

To expect the unexpected shows a thoroughly modern intellect.

I'll always be grateful to the public of intelligent amateurs.

The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.

A woman who thinks she is intelligent demands the same rights as man. An intelligent woman gives up.

I won't insult your intelligence by suggesting that you really believe what you just said.

Cynical realism is the intelligent man's best excuse for doing nothing in an intolerable situation.

Each generation imagines itself to be more intelligent than the one that went before it and wiser than the one that comes after it.

All intelligent thoughts have already been thought, what is necessary is only to try to think them again.