Ethics is in origin the art of recommending to others the sacrifices required for cooperation with oneself.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.
To teach how to live with uncertainty, and yet without being paralyzed by hesitation, is perhaps the chief thing that philosophy in our age can still do for those who study it.
The time you enjoy wasting is not wasted time.
Many a man will have the courage to die gallantly, but will not have the courage to say, or even to think, that the cause for which he is asked to die is an unworthy one.
The universe may have a purpose, but nothing we know suggests that, if so, this purpose has any similarity to ours.