Hume’s skepticism in morals does not arise from his being struck by the diversity of the moral judgments of mankind. As I have indicated, he thinks that people more or less naturally agree in their moral judgments and count the same qualities of character as virtues and vices; it is rather the enthusiasms of religion and superstition that lead to differences, not to mention the corruptions of political power.

John Rawls, Lectures on the History of Moral Philosophy (via philosophybits)