Taken as a story of human achievement, and human blindness, the discoveries in the sciences are among the great epics.

Things which stimulate my curiosity are pretty far removed from the practical and therefore from classification.

We know that the wages of secrecy are corruption. We know that in secrecy error, undetected, will flourish and subvert.

The optimist thinks this is the best of all possible worlds. The pessimist fears it is true.

If we ask, for instance, whether the position of the electron remains the same, we must say 'no'; if we ask whether the electron's position changes with time, we must say 'no'; if we ask whether the electron is at rest, we must say 'no'; if we ask whether it is in motion, we must say 'no'.

There must be no barriers for freedom of inquiry... There is no place for dogma in science. The scientist is free, and must be free to ask any question, to doubt any assertion, to seek for any evidence, to correct any errors.

To try to be happy is to try to build a machine with no other specification than that it shall run noiselessly.