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.

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

The larger the island of knowledge, the longer the shoreline of wonder.