Having knowledge but lacking the power to express it clearly is no better than never having any ideas at all.

Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

The true sign of intelligence is not knowledge but imagination.

Opinion is the medium between knowledge and ignorance.

A man of knowledge lives by acting, not by thinking about acting.

Every addition to true knowledge is an addition to human power.

Freedom means the opportunity to be what we never thought we would be.

The best advice I ever got was that knowledge is power and to keep reading.

The best way to cheer yourself up is to try to cheer somebody else up.

Knowledge is love and light and vision.