Nietzsche's doctrines of amor fati and eternal recurrence in one paragraph:

And that I testify so much is still not enough for me. It is worth while living on the earth: one day, one festival with Zarathustra, hath taught me to love the earth.
'Was that—life?' will I say unto death. 'Well! Once more!'
My friends, what think ye? Will ye not, like me, say unto death: 'Was that—life? For the sake of Zarathustra, well! Once more!'"

—— Thus Spoke Zarathustra, The Fourth and last part, The Drunken Song.