François duc de La Rochefoucauld, Stanisław I Leszczyński (King of Poland) (1851). “Moral Reflections, Sentences and Maxims of Francis, Duc de la Rochefoucauld”, p.164
David Hume (1874). “A Treatise on Human Nature: Being an Attempt to Introduce the Experimental Method of Reasoning Into Moral Subjects; and Dialogues Concerning Natural Religion”, p.245