Science is the acceptance of what works and the rejection of what does not. That needs more courage than we might think.

Power is the by-product of understanding.

The great poem and the deep theorem are new to every reader, and yet are his own experiences, because he himself recreates them.

It is a mistake to think of creative activity as something unusual

The values by which we are to survive are not rules for just and unjust conduct, but are those deeper illuminations in whose light justice and injustice, good and evil, means and ends are seen in fearful sharpness of outline.

Dissent is the native activity of the scientist, and it has got him into a good deal of trouble in the last years. But if that is cut off, what is left will not be a scientist. And I doubt whether it will be a man.

Revolutions are not made by fate but by men.