I don't believe in mathematics.

Three great forces rule the world: stupidity, fear and greed.

We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.

Nothing happens til something moves.

Scientific greatness is less a matter of intelligence than character; if the scientist refuses to compromise or accept incomplete answers and persists in grappling the most basic and difficult questions.

Personally, I experience the greatest degree of pleasure in having contact with works of art. They furnish me with happy feelings of an intensity that I cannot derive from other sources.

To get to know a country, you must have direct contact with the earth. It's futile to gaze at the world through a car window.