Also Sprach Zarathustra III:

“Why did you live near the swamps so long, until you yourself have become a frog and a toad? Does not putrid, spumy, swamp-blood flow through your own veins now that you have learned to croak and revile thus? Why have you not gone into the woods? Or to plow the soil? Does not the sea abound in green islands? I despise your despising; and if you warned me, why did you not warn yourself?

“Out of love alone shall my despising and my warning bird fly up, not out of the swamp.”

….This doctrine, however, I give you, fool, as a parting present: where one can no longer love, there one should pass by.”