Persons become accustomed to scenes of brutality, till they witness them with indifference. Hogarth, that master of human nature, portrayed this tendency in his picture of a dissection at a medical college, where the president maintains the dignity of insensibility over a corpse, which he regards simply as the subject of a lecture. And Horace Walpole, who admired the satire of this picture, finds in it illustration of the idea, that “the legal habitude of viewing shocking scenes hardens the human mind, and renders it unfeeling.”[158] This simple truth, in its most general application, exhibits the condition of the Slave-Master. How can he show sensibility for the common rights of fellow-citizens who sacrifices daily the most sacred rights of others merely to secure _labor without wages_? With him a false standard is necessarily established, bringing with it a blunted moral sense and clouded perceptions, so that, when he does something intrinsically barbarous or mean, he does not blush at the recital. Here, again, I forbear all detail. The reason of the intellect blending with the reason of the heart, the testimony of history fortified by the testimony of good men, an array of unerring figures linked with an array of unerring facts,--these all I might employ. And I might proceed to show how this barbarous influence, beginning on the plantation, diffuses itself throughout society, enters into official conduct, and even mounts into Congress, where for a long time it has exercised a vulgar domination, trampling not only on all the amenities of debate, but absolutely on Parliamentary Law. I shall not open this chapter.