The settled opinion here is, that religion is essentially distinct from Civil Govt., and exempt from its cognizance; that a connexion between them is injurious to both; that there are causes in the human breast which ensure the perpetuity of religion without the aid of the law; that rival sects, with equal rights, exercise mutual censorships in favor of good morals; that if new sects arise with absurd opinions or over-heated imaginations, the proper remedies lie in time, forbearance, and example; that a legal establishment of religion without a toleration could not be thought of, and with a toleration, is no security for public quiet & harmony, but rather a source of discord & animosity; and, finally, that these opinions are supported by experience, which has shewn that every relaxation of the alliance between Law & religion, from the partial example of Holland to its consummation in Pennsylvania, Delaware, New Jersey, &c., has been found as safe in practice as it is sound in theory.

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

Letter to Edward Everett (18 Mar 1823)