Thinking has to be learned in the way dancing has to be learned.

He who has attained the freedom of reason to any extent cannot, for a long time, regard himself otherwise than as a wanderer on the face of the earth - and not even as a traveler towards a final goal, for there is no such thing. But he certainly wants to observe and keep his eyes open to whatever actually happens in the world; therefore he cannot attach his heart too firmly to anything individual; he must have in himself something wandering that takes pleasure in change and transitoriness.

He who is not a bird should not build his nest over abysses.

I am not a human being, I am dynamite.

The weak and the botched shall perish: first principle of our charity.

Narrow souls I cannot abide; There's almost no good or evil inside

Cynicism is the only form in which base souls approach honesty.