The experience of the United States is a happy disproof of the error so long rooted in the unenlightened minds of well-meaning Christians, as well as in the corrupt hearts of persecuting usurpers, that without legal incorporation of religious and civil polity, neither could be supported. A mutual independence is found most friendly to practical Religion, to social harmony, and to political prosperity.

James Madison (1751–1836) American statesman, political theorist, US President (1809–17)

Letter to F.L. Schaeffer (3 Dec. 1821)