Lord Philip Dormer Stanhope Chesterfield, Philip Dormer Stanhope Earl of Chesterfield (1855). “The Works of Lord Chesterfield: Including His Letters to His Son, Etc : to which is Prefixed, an Original Life of the Author”, p.74
Attributed in Reader's Digest, Sept. 1937. The attribution to Twain is obviously spurious because Twain's father died when the future writer was eleven years old.
Lysander Spooner (1882). “Natural Law, Or, The Science of Justice: A Treatise on Natural Law, Natural Justice, Natural Rights, Natural Liberty, and Natural Society : Showing that All Legislation Whatsoever is an Absurdity, a Usurpation, and a Crime”
Thomas Paine (1995). “Thomas Paine: Collected Writings: Common Sense / The American Crisis / Rights of: (Library of America #76)”, p.595, Library of America