"The interests of master and his slaves are the same "The master should make it his business to show his slaves, that the advancement of his individual interest, is at the same time an advancement of theirs. Once they feel this, it will require little compulsion to make them act as becomes them."
(Southern Agriculturalist IX, 1836, a manual for slaveowners in the US) cited by Yasha Levine at http://www.alternet.org/media/129656?page=entire