The Eugenic Society . . . is perpetually bewailing the fact that wage-earners breed faster than middle-class people.

For my part I distrust all generalizations about women, favorable and unfavorable, masculine and feminine, ancient and modern; all alike, I should say, result from paucity of experience.

The twin conceptions of sin and vindictive punishment seem to be at the root of much that is most vigorous, both in religion and politics.

Even in the most purely logical realms, it is insight that first arrives at what is new.

Patriotism is the willingness to kill and be killed for trivial reasons.

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

... the whole world of loneliness, poverty, and pain make a mockery of what human life should be.