To be happy you must have taken the measure of your powers, tasted the fruits of your passion, and learned your place in the world.

...science is nothing but developed perception, interpreted intent, common-sense rounded out and minutely articulated. It is therefore as much an instinctive product, as much a stepping forth of human courage in the dark, as is any inevitable dream or impulsive action.

Eloquence is a republican art, as conversation is an aristocratic one.

Reason in my philosophy is only a harmony among irrational impulses.

The need of exercise is a modern superstition, invented by people who ate too much and had nothing to think about.

Life is not a spectacle or a feast; it is a predicament.

Skepticism is the chastity of the intellect...