“It is my purpose nowhere in these remarks to make personal reproaches; I entertain no ill-will toward any human being, nor any brute, that I know of, not even the skunk across the way to which I referred. Least of all would I reproach the South. I honor her courage and fidelity. Even in a bad, a wicked cause, she shows a united front. All her sons are faithful to the cause of human bondage, because it is their cause. But the North - the poor, timid, mercenary, driveling North - has no such united defenders of her cause, although it is the cause of human liberty. None of the bright lights of the nation shine upon her section. Even her own great men have turned her accusers. She is the victim of low ambition - an ambition which prefers self to country, personal aggrandizement to the high cause of human liberty. She is offered up a sacrifice to propitiate southern tyranny - to conciliate southern treason.”

Letter to A. Bronson (30 July 1838); a similar idea was later more famously expressed by Abraham Lincoln, "With malice towards none, with charity for all, with firmness in the right, as God gives us to see the right".

tr. Hickie 1853, vol. 1, Perseus http://www.perseus.tufts.edu/hopper/text.jsp?doc=Aristoph.+Cl.+998
Clouds (423 BC)

Letter to Charles F. Adams (1863), as quoted in Papers Relating to the Foreign Relations of the United States, Volume 2 https://books.google.com/books?id=xe9TAAAAcAAJ&pg=PA150&lpg=PA150&dq=%22the+cause+of+the+United+States+is+the+cause+of+human%22&source=bl&ots=WHM-9fK5zZ&sig=3aspBI67n5cNTU2ARF6OaNTyCDQ&hl=en&sa=X&ved=0CB4Q6AEwAGoVChMIt7WJl9msxwIViDI-Ch3mpgBq#v=onepage&q=%22the%20cause%20of%20the%20United%20States%20is%20the%20cause%20of%20human%22&f=false, p. 150.

Source: Dance with the Devil

Can vei la lauzeta mover, line 33; translation by Frederick Goldin, from Boris Ford (ed.) Medieval Literature: The European Inheritance (1983) p. 440.

Source: Love in the Afternoon

"Appeal to Compatriots" (1966)
1960's

Source: The Tales of Alvin Maker, The Crystal City (2003), Chapter 17 “Foundation” (p. 334).

Reported in Walter J. Miller, "Calhoun as a Lawyer and Statesman"' part 2, The Green Bag (June 1899), p. 271. Miller states "I will cite his own words", but this quotation is reported as not verified in Calhoun's writings in Respectfully Quoted: A Dictionary of Quotations (1989).