Philosophical systems are wholly true for their founders only.

Reckoned physiologically, everything ugly weakens and afflicts man. It recalls decay, danger, impotence; he actually suffers a loss of energy in its presence. The effect of the ugly can be measured with a dynamometer. Whenever man feels in any way depressed, he senses the proximity of something ugly. His feeling of power, his will to power, his courage, his pride - they decline with the ugly, they increase with the beautiful.

There are people who want to make men's lives more difficult for no other reason than the chance it provides them afterwards to offer their prescription for alleviating life; their Christianity, for instance.

But by my love and hope I beseech you: do not throw away the hero in your soul! Hold holy your highest hope!

All truths are bloody truths to me.

Perhaps I know best why it is man alone who laughs; he alone suffers so deeply that he had to invent laughter.

Ye shall only have foes to be hated; but not foes to be despised: ye must be proud of your foes.