Mankind must work continually to produce individual great human beings - this and nothing else is the task... for the question is this : How can your life, the individual life, retain the highest value, the deepest significance? Only by living for the good of the rarest and most valuable specimens.
The concepts "soul", "spirit" and last of all the concept "immortal soul" were invented in order to despise the body, in order to make it sick - "holy" - in order to cultivate an attitude of appalling disrespect for all things in life which deserve to be treated seriously i.
Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing.
Instruments and playthings are sense and spirit: behind them there is still the Self. The Self seeketh with the eyes of the senses, it hearkeneth also with the ears of the spirit.
Noble and wise men once believed in the music of the spheres: noble and wise men still continue to believe in the "moral significance of existence." But one day even this sphere-music will no longer be audible to them! They will wake up and take note that their ears were dreaming.
The trodden worm curls up. This testifies to its caution. It thus reduces its chances of being trodden upon again. In the language of morality: Humility.