Indignation is a submission of our thoughts, but not of our desires.

All movements go too far.

They must often change, who would be constant in happiness or wisdom. Those who continually search for happiness will never find it. Happiness is made, not found. To be without some of the things you want is an indispensable part of happiness.

The man who only loves beautiful things is dreaming, whereas the man who knows absolute beauty is wide awake.

If you question any candid person who is no longer young, he is very likely to tell you that, having tasted life in this world, he has no wish to begin again as a "new boy" in another.

Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.

Ethics is in origin the art of recommending to others the sacrifices required for cooperation with oneself.