Charles Haddon Spurgeon (1988). “Spurgeon at His Best: Over 2200 Striking Quotations from the World's Most Exhaustive and Widely-read Sermon Series”, Baker Publishing Group
Thomas Hobbes, John Charles Addison Gaskin (1999). “The Elements of Law, Natural and Politic: Part I, Human Nature, Part II, De Corpore Politico ; with Three Lives”, p.162, Oxford University Press, USA