Industriousness and conscientiousness are often at odds, because industriousness wants to pick the still sour fruit from the tree,while conscientiousness lets it hang there too long, until it falls and bruises.

Happiness: being able to forget or, to express in a more learned fashion.

The tragedy is that we cannot believe the dogmas of religion and metaphysics if we have the strict methods of truth in heart and head, but on the other hand, we have become through the development of humanity so tenderly suffering that we need the highest kind of means of salvation and consolation: whence arises the danger that man may bleed to death through the truth that he realises.

Your soul will be dead even before your body: fear nothing further.

Strength is the morality of the man who stands out from the rest, and it is mine.

Be careful when you fight the monsters, lest you become one.

Deception, flattering, lying, deluding, talking behind the back, putting up a false front, living in borrowed splendor, wearing a mask, hiding behind convention, playing a role for others and for oneself -- in short, a continuous fluttering around the solitary flame of vanity -- is so much the rule and the law among men that there is almost nothing which is less comprehensible than how an honest and pure drive for truth could have arisen among them.