“To make a contented slave, you must make a thoughtless one. It is necessary to darken his moral and mental vision, and, as far as possible, to annihilate his power of reason. He must be able to detect no inconsistencies in slavery. The man that takes his earnings, must be able to convince him that he has a perfect right to do so. It must not depend upon mere force; the slave must know no Higher Law than his master's will. The whole relationship must not only demonstrate, to his mind, its necessity, but its absolute rightfulness.”