A book should long for pen, ink, and writing-table: but usually it is pen, ink, and writing-table that long for a book. That is why books are so negligible nowadays.

It is our taste that decides against Christianity now, no longer our reasons.

Be careful, lest in casting out your demon you exorcise the best thing in you.

It is an end with priests and gods, if man becomes scientific. Moral: science is the thing forbidden in itself - it alone is forbidden. Science is the first sin, the germ of all sin, original sin. This alones is mortality: Thou shalt not know.

A labyrinthine man never seeks the truth, but only his Ariadne.

Danger alone acquaints us with our own resources, our virtues, our armor and weapons, our spirit, and forces us to be strong.

Objectivity and justice have nothing to do with one another.