Man alone resists the direction of gravitation: he constantly wants to fallupwards.
(Friedrich Nietzsche (1844-1900), German philosopher, classical scholar, critic of culture. Friedrich Nietzsche, Sämtliche Werke: Kritische Studienausgabe, vol. 1, p. 95, selection 3, number 343, eds. Giorgio Colli and Mazzino Montinari, Berlin, de Gruyter (1980). Unpublished fragments dating to SummerAutumn 1882.)
We learn about life not from plusses alone, but from minuses as well.
(Anton Pavlovich Chekhov (1860-1904), Russian author, playwright. Letter, December 23, 1888, to his editor and friend, A.S. Suvorin. Complete Works and Letters in Thirty Volumes, Letters, vol. 3, p. 99, "Nauka" (1976).)