What makes life 'worth living'? - The awareness that there is something for which one is ready to risk one's life.
Oh, my friends, that your self be in your deed as the mother is in her child - let that be your word concerning virtue!
All great things must first wear terrifying and monstrous masks in order to inscribe themselves on the hearts of humanity.
But that "other world" is well concealed from man, that dehumanised, inhuman world, which is a celestial naught; and the bowels of existence do not speak unto man, except as man.
Every acquisition, every step forward in knowledge is the result of courage, of severity toward oneself, of cleanliness with respect to oneself.
Become who you are!