Some have asked if the stock of men could not be improved,—if they could not be bred as cattle. Let Love be purified, and all the rest will follow. A pure love is thus, indeed, the panacea for all the ills of the world.
Henry David Thoreau (1817–1862), U.S. philosopher, author, naturalist. Essay on "Chastity and Sensuality" in letter, September 1852, to Harrison Blake, in The Writings of Henry David Thoreau, vol. 6, p. 208, Houghton Mifflin (1906).