Rev. Matthew Harrison, the president of the Lutheran Church Missouri Synod, discusses a letter President James Madison sent to a Lutheran pastor in 1821 upon reading one of his sermons:
It is a pleasing and persuasive example of pious zeal, united with pure benevolence and of a cordial attachment to a particular creed, untinctured with sectarian illiberality. It illustrates the excellence of a system which, by a due distinction, to which the genius and courage of Luther led the way, between what is due to Caesar and what is due God, best promotes the discharge of both obligations. 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 a 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.