Knowledge is power only if man knows what facts not to bother with.

Most remarks that are worth making are commonplace remarks. The things that makes them worth saying is that we really mean them.

[History is] the story of the magnificent rear-guard action fought during several thousand years by dogma against curiosity.

Most of us can remember a time when a birthday - especially if it was one's own - brightened the world as if a second sun has risen.

I sometimes suspect that half our difficulties are imaginary and that if we kept quiet about them they would disappear.

Every man of genius is considerably helped by being dead.

When the last Puritan has disappeared from the earth, the man of science will take his place as a killjoy, and we shall be given the same old advice but for different reasons.