Knowledge is the life of the mind.

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

We know accurately only when we know little, with knowledge doubt increases.

The natural desire of good men is knowledge.

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

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

Wisdom is the knowledge of good and evil, not the strength to choose between the two.

The true sign of intelligence is not knowledge but imagination.

The degree of one's emotions varies inversely with one's knowledge of the facts.

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.