Among the features peculiar to the political system of the United States is the perfect equality of rights which it secures to every religious sect. And it is particularly pleasing to observe in the good citizenship of such as have been most distrusted and oppressed elsewhere, a happy illustration of the safety and success of this experiment of a just and benignant policy. Equal laws protecting equal rights, are found as they ought to be presumed, the best guarantee of loyalty, and love of country; as well as best calculated to cherish that mutual respect and good will among citizens of every religious denomination which are necessary to social harmony and most favorable to the advancement of truth.

James Madison to Jacob De La Motta, August 1820. Manuscript Division, Papers of James Madison. - Letter to Robert J. Evans (1819)