W.E.B. Du Bois (1868–1963) American sociologist, historian, activist and writer
The Suppression of the African Slave Trade to the United States of America, 1638-1870 (1897), ch. XII: The Essentials in the Struggle, paragraph 93: "The Moral Movement" http://web.archive.org/20000818045142/members.tripod.com/~DuBois/supp.html