A good world needs knowledge, kindliness, and courage; it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

Undoubtedly the desire for food has been and still is one of the main causes of political events.

The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it.

The first step in wisdom, as well as in morality, is to open the windows of the ego as wide as possible.

Science does not aim at establishing immutable truths and eternal dogmas; its aim is to approach the truth by successive approximations, without claiming that at any stage final and complete accuracy has been achieved.

Every increase in knowledge requires an increase in wisdom

Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.