The discipline of suffering, of great suffering - do you not know that it is this discipline alone that has produced all the elevations of humanity so far?

Science rushes headlong, without selectivity, without "taste," at whatever is knowable, in the blind desire to know all at any cost.

Assuming that we have trained our imagination to denounce the past, we will not suffer much from unfulfilled wishes.

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.

All idealists imagine that the causes they serve are fundamentally better than any other causes in the world, and they refuse to believe that if their cause is to flourish at all it requires precisely the same foul-smelling manure that is necessary to all other human undertakings.

One sticks to an opinion because he prides himself on having come to it on his own, and another because he has taken great pains to learn it and is proud to have grasped it: and so both do so out of vanity.

When a woman has scholarly inclinations there is usually something wrong with her sexuality.