Joseph Butler, Samuel Hallifax (1828). “The Works of the Right Reverend Father in God, Joseph Butler: To which is Prefixed, an Account of the Character and Writings of the Author”
Joseph Butler, Stephen L. Darwall (1983). “Five Sermons, Preached at the Rolls Chapel and A Dissertation Upon the Nature of Virtue”, p.47, Hackett Publishing
Francis Quarles (1844). “Enchiridion Institutions, Essays and Maxims, political, moral & divine. Divided into four centuries. By Francis Quarles”, p.75
Thomas Jefferson (1854). “The Writings of Thomas Jefferson: Being His Autobiography, Correspondence, Reports, Messages, Addresses, and Other Writings, Official and Private : Published by the Order of the Joint Committee of Congress on the Library, from the Original Manuscripts, Deposited in the Department of State”, p.496