You can certainly destroy enough of humanity so that only the greatest act of faith can persuade you that what's left will be human.

A pragmatist is concerned with results, not reality.

To the confusion of our enemies.

We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism.

The open society, the unrestricted access to knowledge, the unplanned and uninhibited association of men for its furtherance-these are what may make a vast, complex, ever growing, ever changing, ever more specialized and expert technological world, nevertheless a world of human community.

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.