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

We know too much for one man to know too much.

Science is not everything, but science is very beautiful.

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

To the confusion of our enemies.

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

[About the great synthesis of atomic physics in the 1920s:] It was a heroic time. It was not the doing of any one man; it involved the collaboration of scores of scientists from many different lands. But from the first to last the deeply creative, subtle and critical spirit of Niels Bohr guided, restrained, deepened and finally transmuted the enterprise.