There is no such thing as an underestimate of average intelligence.

The Jewish question is really the most serious of our problems.

Laplace would have found it child's-play to fix a ratio of progression in mathematical science between Descartes, Leibnitz, Newton and himself

I am an anarchist in politics and an impressionist in art as well as a symbolist in literature. Not that I understand what these terms mean, but I take them to be all merely synonyms of pessimist.

No man, however strong, can serve ten years as schoolmaster, priest, or Senator, and remain fit for anything else.

The idea that any personal deity could find pleasure or profit in torturing a poor woman, by accident, with a fiendish cruelty known to man only in perverted and insane temperaments, could not be held for a moment. For pure blasphemy, it made pure atheism a comfort.

Nothing is easier than to teach historical method, but, when learned, it has little use.