James Madison on the Separation of Church and State

“The civil government functions with complete success by the total separation of the Church from the State.”
~James Madison, 1819, Writings, 8:432, quoted from Gene Garman, “Essays In Addition to America’s Real Religion” 

“And I have no doubt that every new example will succeed, as every past one has done, in shewing that religion & Govt will both exist in greater purity, the less they are mixed together.”
~James Madison, letter to Edward Livingston, July 10, 1822

“Every new and successful example of a perfect separation between ecclesiastical and civil matters is of importance.”
~James Madison, letter, 1822

“Strongly guarded as is the separation between Religion and Government in the Constitution of the United States, the danger of encroachment by Ecclesiastical Bodies, may be illustrated by precedents already furnished in their short history.”
~James Madison; Monopolies, Perpetuities, Corporations, Ecclesiastical
Endowments