What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.

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

Your intellect may be confused but your emotions will never lie to you.

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.

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

An intellectual is someone whose mind watches itself.

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.

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