if only the "tolerable administration of justice" didn't cover slavery in all its many forms  
  
"From the experience of all ages and nations, I believe, that the work done by free men comes cheaper in the end than the work performed by slaves. Whatever work he does, beyond what is sufficient to purchase his own maintenance, can be squeezed out of him by violence only, and not by any interest of his own." 
  
"    * There is not a negro from the coast of Africa who does not, in this respect, possess a degree of magnanimity which the soul of his sordid master is too often scarce capable of conceiving. Fortune never exerted more cruelly her empire over mankind, than when she subjected those nations of heroes to the refuse of the jails of Europe, to wretches who possess the virtues neither of the countries which they come from, nor of those which they go to, and whose levity, brutality, and baseness, so justly expose them to the contempt of the vanquished." 
  
"This disposition to admire, and almost to worship , the rich and powerful, and to despise , or , at least neglect persons of poor and mean conditions, though necessary both to establish and to maintain the distinction of ranks and the order of society, is, at the same time, the great and most universal cause of the corruption of our moral sentiments." 
  
~same guy. 
  
I think you'd enjoy reading his stuff if you haven't already. 
 
i like the enlightenment fellows just fine, damn near all of them, though their work makes poor night-time work for me i fear 
  
smith and jefferson and those fine folk were torn by the systems they perpetuated, still they persisted in them - the slavery of today of course in most metrical ways is far more splendid, but it still has the stink of a slaveship - ahh, i'm content enough