To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.

This idea of weapons of mass extermination is utterly horrible and is something which no one with one spark of humanity can tolerate.

Happiness, as is evident, depends partly upon external circumstances and partly upon oneself.

Almost everything that distinguishes the modern world from earlier centuries is attributable to science, which achieved its most spectacular triumphs in the seventeenth century.

The degree of one's emotions varies inversely with one's knowledge of the facts - the less you know the hotter you get.

We are faced with the paradoxical fact that education has become one of the chief obstacles to intelligence and freedom of thought.

What we cannot think we cannot think, therefore we also cannot say what we cannot think.