See Hangman, number four

Do not let them fly away from earthly things
and beat with their wings against eternal walls. Alas, there has always been so
much virtue that has flown away. Lead back to the earth the virtue that flew
away, as I do—back to the body, back to life, that it may give the earth a
meaning, a human meaning.

—Friedrich Nietzsche, Thus Spoke Zarathustra