Happiness, as is evident, depends partly upon external circumstances and partly upon oneself.

Men fear thought as they fear nothing else on earth - more than ruin, more even than death.

Every increase in knowledge requires an increase in wisdom

The place of the father in the modern suburban family is a very small one, particularly if he plays golf.

My own view on religion is that of Lucretius. I regard it as a disease born of fear and as a source of untold misery to the human race. I cannot, however, deny that it has made some contributions to civilisation. It helped in early days to fix the calendar, and it caused Egyptian priests to chronicle eclipses with such care that in time they became able to predict them. These two services I am prepared to acknowledge, but I do not know of any others.

The only thing that will redeem mankind is cooperation.

Calculus required continuity, and continuity was supposed to require the infinitely little; but nobody could discover what the infinitely little might be.