Improvements are invented only by those who can feel that something is not good.

No one dies of fatal truths nowadays: there are too many antidotes.

Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you.

Suspicious.- To admit a belief merely because it is a custom - but that means to be dishonest, cowardly, lazy! - And so could dishonesty, cowardice and laziness be the preconditions for morality?

[Heraclitus had] a regal air of certainty.

The rights which a man arrogates to himself are relative to the duties which he sets himself, and to the tasks which he feels capable of performing.

Christianity in particular should be dubbed a great treasure-chamber of ingenious consolations, such a store of refreshing, soothing, deadening drugs has it accumulated within itself.