Good teaching must be slow enough so that it is not confusing, and fast enough so that it is not boring.

Nuclear war is inevitable, says the pessimists; Nuclear war is impossible, says the optimists; Nuclear war is inevitable unless we make it impossible, says the realists.

But what is significant is that if you don't want to like and accept somebody, one excuse is as good as another. The objective facts don't matter, and the reasons are never as ‘reasonable' as we like to think they are.

The profound immoralities of our time are cruelty, indifference, injustice and the use of others as means rather than ends in themselves.

This is a lesson mankind has not yet learned. We identify, and stratify, and treat persons largely on the basis of their accidental (physical) characteristics, which have no deeper meaning.

People decline invitations when they are "indisposed" physically, and I wish they would do likewise when they feel indisposed emotionally. A person has no more right to attend a party with a head full of venom than with a throat full of virus.

Democracy is the only system that persists in asking the powers that be whether they are the powers that ought to be.