That little hypocrites and half-crazed people dare to imagine that on their account the laws of nature are constantly broken; such an enhancement of every kind of selfishness to infinity, to impudence, cannot be branded with sufficient contempt. And yet Christianity owes its triumph to this pitiable flattery of personal vanity.

I need solitude, which is to say, recovery, return to my self, the breath of a free, light, playful air.

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

Art raises its head where creeds relax.

Against war one might say that it makes the victor stupid and the vanquished malicious. In its favor, that in producing these two effects it barbarizes, and so makes the combatants more natural. For culture it is a sleep or a wintertime, and man emerges from it stronger for good and for evil.

Mystical explanations are thought to be deep; the truth is that they are not even shallow.

At every step one has to wrestle for truth; one has to surrender for it almost everything to which the heart, to which our love, our trust in life, cling otherwise. That requires greatness of soul: the service of truth is the hardest service. What does it mean, after all, to have integrity in matters of the spirit? That one is severe against one's heart...that one makes of every Yes and No a matter of conscience.