Francis Fedric,  Slave Life in Virginia and Kentucky:

A badge of aristocracy among slaveholders is the number of slaves they hold, and white people of equal fortune are not generally allowed to visit slaveholders, who look down upon them with a species of contempt. One remarkable fact which I wish to impress upon my readers is this, that the white men born in those districts in America where slaves are held, are just as capable of bearing the heat as the black men. And the proof is this, that in the harvest-time, when the two are working together in the fields, the white men can actually beat the negroes at the work, and very often the black man has to give up, and is laughed at by the white labourer. They say, “Only give us sufficient wages, and we will work by the side of any nigger alive.” It is quite shocking to hear slaveholders distorting even the Bible itself to prove that a negro alone was made for hard work. On the cunning of slaves he says; I remember a slave, who was not treated very well with respect to food and other things, when he had done his work being lectured by his mistress on the duties of a slave, she telling him that in proportion to his obedience and servility as a slave he would be loved by God. Slaves are all of them full of this sly, artful, indirect way of conveying what they dare not speak out, and their humour is very often the medium of hinting wholesome truths. Is not cunning always the natural consequence of tyranny?