Will and Slavery

The three readings in concert with one another create an interesting connection between the two topics on liberty. We analyze liberty of the slave and liberty of the soul. It is interesting to see predestination in reference to slavery, as it is in a sense the same definition as which is given to a lack of will within predestination. Wesley sets up a system of predestination wherein God "in his unchangeable good pleasure, hath decreed to leave them in common misery." Similarly, Wesley notes that one of the precepts of slavery is "an obligation of perpetual service, which only the consent of the master can dissolve." The master in these cases has no obligation of kindness to the person in question. The situations in both cases lead to death, either an earthly or a spiritual death, but both in misery. It is interesting, then, to look at the treatise on Will during a time and which slavery persisted.   I am curious about the motivations of the author and if he ever considered using his argument in response to the problem of slavery, or if  he simultaneously supported it.  Was the doctrine of predestination used in favor of slavery? And was its opposition a call to end slavery? How far did Wesley go on his attack on slavery?  How urgently was the problem of slavery considered within Wesley's time?