Living in a constant chase after gain compels people to expend their spirit to the point of exhaustion.

The vanity of others runs counter to our taste only when it runs counter to our vanity.

The most dangerous follower is the one whose defection would destroy the whole party: hence, the best follower.

The most general deficiency in our sort of culture and education is gradually dawning on me: no one learns, no one strives towards, no one teaches--enduring loneliness.

Evolution does not make happiness its goal; it aims simply at evolution and nothing else.

Only ideas won by walking have any value.

To have to fight the instincts - that is the definition of decadence: as long as life is ascending, happiness equals instinct.