If only the fit survive and if the fitter they are the longer they survive, then Volvox must have demonstrated its superb fitness more conclusively than any higher animal ever has.

The rare moment is not the moment when there is something worth looking at, but the moment when we are capable of seeing.

Logic is the art of going wrong with confidence.

Civilizations die from philosophical calm, irony, and a sense of fair play quite as surely as they die of debauchery.

We have not merely escaped from something but into something... We have joined the greatest of all communities, which is not that of man alone but of everything which shares with us the great adventure of being alive.

A humanist is anyone who rejects the attempt to describe or account for man wholly on the basis of physics, chemistry or animal behaviour.

Those whose conscience demands that they defy authority in some ways that involve great consequences must be willing to accept some penalty.