John Locke’s An Essay Concerning Human Understanding begins with a clear statement of an epistemological goal: to explain the limits of human knowledge, opinion, and ignorance. The actual text of the Essay, in stark contrast, takes a long and seemingly meandering path before returning to that goal at the Essay’s end—one with many detours through questions in philosophy of mind, metaphysics, and philosophy of language. Over time, Locke scholarship has come to focu...