"The Intelligent Investor: The Classic Text on Value Investing". Book by Benjamin Graham. Chapter II, The Investor and Stock-Market Fluctuations, p. 38, 1949.
Thomas Hobbes (1750). “The Moral and Political Works of Thomas Hobbes of Malmesbury: Never Before Collected Together : To which is Prefixed, the Author's Life, Extracted from that Said to be Written by Himself, ...”, p.133