George Washington, Jared Sparks (1848). “The Writings of George Washington: pt. V. Speeches and messages to Congress, proclamations, and addresses”, p.159
Alexander Hamilton, James Madison, John Jay (2015). “The Federalist Papers: A Collection of Essays Written in Favour of the New Constitution”, p.355, Coventry House Publishing
George Santayana (1937). “The Works of George Santayana: Scepticism and animal faith. Some meanings of the word "is". Literal and symbolic knowledge. The unknowable”