Signer of the Declaration of Independence and Second President of the United States
[I]t is religion and morality alone which can establish the principles upon which freedom can securely stand. The only foundation of a free constitution is pure virtue.
(Source: John Adams, The Works of John Adams, Second President of the United States, Charles Francis Adams, editor (Boston: Little, Brown, 1854), Vol. IX, p. 401, to Zabdiel Adams on June 21, 1776.)