I have Wiki'ed him. An interesting character for sure.
"Unlike the white man, the negro has no hope of changing and improving his condition whilst free and every other form of government than that of slavery has signally failed his case. He is an enemy to himself, and an intolerable pest and nuisance to society, where ever among the whites he is free [...] it is the right and duty of the State to enslave them, because experience has clearly proved that it is the only practicable mode of governing them."