henry david thoreau, from "walking" (1862):
I rejoice that horses and steers have to be broken before they can be made the slaves of men, and that men themselves have some wild oats still left to sow before they become submissive members of society. Undoubtedly, all men are not equally fit subjects for civilization; and because the majority, like dogs and sheep, are tame by inherited disposition, this is no reason why the others should have their natures broken that they may be reduced to the same level. Men are in the main alike, but they were made several in order that they might be various.
nathaniel peabody rogers, from "politics" (1843):
Good farmers are learning that there is a better way to treat their cattle than by blows. The hostler of intelligence and kindness, is ceasing to maul his noble horse. They are leaving off the practice of breaking steers and colts, for the reason that it is cruel: undeserved by the horse and unworthy of the employer, and because a whole horse or ox is better than a broken one. Political action is unfit even for brute animals. Is it fitter for man? Is humanity less susceptible of moral influences than what we call brutality? A politician is but a man driver, a human teamster. His business is to control men by the whip and the goad. His occupation would be unlawful and inexpedient toward even the cattle.
thoreau was demonstrably reading rogers in 1843.