You people of the South don't know what you are doing. This country will be drenched in blood, and God only knows how it will end.
Source, in full
Comments to Prof. David F. Boyd at the Louisiana State Seminary (24 December 1860), as quoted in The Civil War : A Book of Quotations (2004) by Robert Blaisdell. Also quoted in The Civil War: A Narrative (1986) by Shelby Foote, p. 58.