Knowledge is knowing that we cannot know.

We regard intelligence as man's main characteristic and we know that there is no superiority which intelligence cannot confer on us no inferiority for which it cannot compensate.

If you are going to have to play defense all the time you cannot have the kind of ingenuity assertiveness independence and intelligence which is what has made our country strong.

I have met with some of them - very honest fellows who with all their stupidity had a kind of intelligence and an upright good sense which cannot be the characteristics of fools.

Where the stakes are the highest in the war on terror we cannot possibly succeed without extraordinary international cooperation. Effective international police actions require the highest degree of intelligence sharing planning and collaborative enforcement.

A man has to learn that he cannot command things but that he can command himself that he cannot coerce the wills of others but that he can mold and master his own will: and things serve him who serves Truth people seek guidance of him who is master of himself.

Imagination allows us to escape the predictable. It enables us to reply to the common wisdom that we cannot soar by saying 'Just watch!'

The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.

Never lose sight of the fact that all human felicity lies in man's imagination and that he cannot think to attain it unless he heeds all his caprices. The most fortunate of persons is he who has the most means to satisfy his vagaries.

I believe in the imagination. What I cannot see is infinitely more important than what I can see.