The intelligent man who is proud of his intelligence is like the condemned man who is proud of his large cell.

Three-quarters of the sicknesses of intelligent people come from their intelligence. They need at least a doctor who can understand this sickness.

To be able to fill leisure intelligently is the last product of civilization.

It is not worth an intelligent man's time to be in the majority. By definition there are already enough people to do that.

A person must have a certain amount of intelligent ignorance to get anywhere.

Man is the most intelligent of the animals - and the most silly.

The intelligent man is one who has successfully fulfilled many accomplishments and is yet willing to learn more.

There are only two races on this planet - the intelligent and the stupid.

There is no method but to be very intelligent.

Ah! yes I know: those who see me rarely trust my word: I must look too intelligent to keep it.

There are some ideas so wrong that only a very intelligent person could believe in them.

An intelligent person is never afraid or ashamed to find errors in his understanding of things.

We have now sunk to a depth at which restatement of the obvious is the first duty of intelligent men.

The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.

It is the mark of a truly intelligent person to be moved by statistics.

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

I know that I am intelligent because I know that I know nothing.