The whole conception of a God is a conception derived from the ancient oriental despotisms. It is a conception quite unworthy of free men. We ought to stand up and look the world frankly in the face. We ought to make the best we can of the world, and if it is not so good as we wish, after all it will still be better than what these others have made of it in all these ages.

Change is scientific; progress is ethical; change is indubitable, whereas progress is a matter of controversy.

Continuity of purpose is one of the most essential ingredients of happiness in the long run, and for most men that comes chiefly through their work.

I believe four ingredients are necessary for happiness: health, warm personal relations, sufficient means to keep you from want, and successful work.

Fear is the main source of superstition, and one of the main sources of cruelty. To conquer fear is the beginning of wisdom.

Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

Any philosophy worth taking seriously would have to be built upon a firm foundation of unyielding despair.