(Henry David Thoreau (1817-1862), U.S. philosopher, author, naturalist. A Week on the Concord and Merrimack Rivers (1849), in The Writings of Henry David Thoreau, vol. 1, p. 405, Houghton Mifflin (1906).)
The crows maintain that a single crow could destroy the heavens. There is no doubt of that, but it proves nothing against the heavens, for heaven simply means: the impossibility of crows.
(Franz Kafka (1883-1924), Prague German Jewish author, novelist. The Third Notebook, November 21, 1917. The Blue Octavo Notebooks, ed. Max Brod, trans. by Ernst Kaiser and Eithne Wilkins. Exact Change, Cambridge, MA (1991). Dearest Father: Stories and Other Writings, trans. by Ernst Kaiser and Eithne Wilkins, New York, Schocken Books (1954).)
The trouble with kingdoms of heaven on earth is that they're liable to come to pass, and then their fraudulence is apparent for all to see. We need a kingdom of heaven in Heaven, if only because it can't be realised.
(Malcolm Muggeridge (1903-1990), British broadcaster. "Me and Myself," Jesus Rediscovered (1979).)
The idealist is incorrigible: if he is expelled from his heaven, he makes an ideal out of hell.
(Friedrich Nietzsche (1844-1900), German philosopher, classical scholar, critic of culture. Friedrich Nietzsche, Sämtliche Werke: Kritische Studienausgabe, vol. 2, p. 388, eds. Giorgio Colli and Mazzino Montinari, Berlin, de Gruyter (1980). Mixed Opinions and Maxims, aphorism 23 (1879).)