“Had Congress undertaken to guarantee religious freedom, or any particular species of it, they would then have had a pretense to interfere in a subject they have nothing to do with. Each state, so far as the clause in question does not interfere, must be left to the operation of its own principles.”

Source: Look Away!: A History of the Confederate States of America (2002), pp. 97–98

1850s, Speech at Chicago (1858)
Context: I believe each individual is naturally entitled to do as he pleases with himself and the fruit of his labor, so far as it in no wise interferes with any other man's rights, that each community, as a State, has a right to do exactly as it pleases with all the concerns within that State that interfere with the right of no other State, and that the general government, upon principle, has no right to interfere with anything other than that general class of things that does concern the whole.

1830s, Illinois House Journal (1837)

The Mike Wallace Interview (1958)
Context: The separation of church and state is necessary partly because if religion is good then the state shouldn't interfere with the religious vision or with the religious prophet. There must be a realm of truth beyond political competence, that's why there must be a separation of churches, but if religion is bad and a bad religion is one that gives an ultimate sanctity to some particular cause. Then religion mustn't interfere with the state — so one of the basic Democratic principles as we know it in America is the separation of church and state. … A church has the right to set its own standards within its community. I don't think it has a right to prohibit birth control or to enforce upon a secular society its conception of divorce and the indissolubility of the marriage tie.

"Tulsi Gabbard: Religious bigotry is un-American", in Religious News Service (26 January 2019)
2019

What Do You Say After You Say Hello? (1973)

First Debate with Stephen Douglas in the Lincoln-Douglas debates http://www.bartleby.com/251/ of the 1858 campaign for the U.S. Senate, at Ottawa, Illinois (21 August 1858). Lincoln later quoted himself and repeated this statement in his first Inaugural Address (4 March 1861) to emphasize that any acts of secession were over-reactions to his election. During the war which followed his election he eventually declared the Emancipation Proclamation, freeing the slaves in those states in rebellion against the union, arguably as a war measure rather than as an entirely political or moral initiative.
1850s, Lincoln–Douglas debates (1858)

Speech to the Economic Students' Union at the School of Economics and Political Science, London (14 December 1900), quoted in The Times (17 December 1900), p. 13.
1900s

Sketches of American Policy. (1785) p.27