About this time two others, men of great talents and learning, promoted the cause of the injured Africans, by the manner in which they introduced them to notice in their respective works. Dr. Adam Smith, in his Theory of Moral Sentiments, had, so early as the year 1759, held them up in an honourable, and their tyrants in a degrading light. "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 gaols of Europe, to wretches who possess the virtue neither of the countries they came from, nor of those they go to, and whose levity, brutality, and baseness so justly expose them to the contempt of the vanquished." And now, in 1776, in his Wealth of Nations he showed in a forcible manner (for he appealed to the interest of those concerned,) the dearness of African labour; or the impolicy of employing slaves.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "About this time two others, men of great talents and learning, promoted the cause of the injured Africans, by the manner in which they introduced them to notice in their respective works. Dr. Adam Smith, in his Theory of Moral Sentiments, had, so early as the year 1759, held them up in an honourable, and their tyrants in a degrading light. "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 gaols of Europe, to wretches who possess the virtue neither of the countries they came from, nor of those they go to, and whose levity, brutality, and baseness so justly expose them to the contempt of the vanquished." And now, in 1776, in his Wealth of Nations he showed in a forcible manner (for he appealed to the interest of those concerned,) the dearness of African labour; or the impolicy of employing slaves." in the context of "Thomas Clarkson The History of the Rise, Progress, and Accomplishment of the Abolition of the African Slave-Trade by the British Parliament, p. 75 (1808) https://books.google.com/books?id=mfVeAAAAcAAJ&pg=PA75http://www.gutenberg.org/ebooks/10633" to mean that wisdom is timeless.