The popular scientific books by our scientists aren't the outcome of hard work, but are written when they are resting on their laurels.

Death is not an event in life: we do not live to experience death.

Where our language suggests a body and there is none: there, we should like to say, is a spirit.

It seems to me that, in every culture, I come across a chapter headed 'Wisdom.' And then I know exactly what is going to follow: 'Vanity of vanities, all is vanity.'

It would strike me as ridiculous to want to doubt the existence of Napoleon; but if someone doubted the existence of the earth 150years ago, perhaps I should be more willing to listen, for now he is doubting our whole system of evidence.

A wheel that can be turned though nothing else moves with it, is not a part of the mechanism.

[M]an is fulfilling the purpose of existence who no longer needs to have any purpose except to live. That is to say, who is content.