Man has an intense desire for assured knowledge.

The true definition of madness is repeating the same action, over and over, hoping for a different result.

The only thing more dangerous than ignorance is arrogance

Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else.

Thanks to my fortunate idea of introducing the relativity principle into physics, you (and others) now enormously overrate my scientific abilities, to the point where this makes me quite uncomfortable.

Out yonder there was this huge world...which stands before us like a great eternal riddle.

Compound interest on debt was the banker's greatest invention, to capture, and enslave, a productive society.