 Second, one may make a stronger assumption about the scope of moral knowledge, at least for some people. Some people, one may assume, are (or become) especially good at acquiring moral knowledge; they have a measure of practical wisdom or expertise. Their knowledge thus readily extends not just to their actual circumstances but to a broad array of novel circumstances as they arise. In so far as this is so, we should like to have a good explanation not only of how humans acquire specific knowledge but also of how they develop over time into more competent moral knowers (Bakhurst 2005, 2013).