"The only foundation of a free Constitution is pure Virtue..."

"Statesmen, my dear Sir, may plan and speculate for Liberty, but it 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, and if this cannot be inspired into our People in a greater Measure than they have it now, They may change their Rulers and the forms of Government, but they will not obtain a lasting Liberty. They will only exchange Tyrants and Tyrannies."

John Adams, Letter to Zabdiel Adams, 21 June 1776.