 Herder’s theories of interpretation and translation both rest on a certain epoch-making insight of his: Whereas such eminent Enlightenment philosopher-historians as Hume and Voltaire had normally still held that, as Hume put it, “mankind are so much the same in all times and places that history informs us of nothing new or strange” (1748: section VIII, part I, 65), Herder discovered, or at least saw more clearly than anyone before him, that this was false, that peoples from different historical periods and cultures vary tremendously in their concepts, beliefs, values, (perceptual and affective) sensations, and so forth. He also recognized that similar, albeit usually less dramatic, variations occur even between individuals within a single period and culture. These positions are prominent in many of Herder’s works (see, e.g., On the Change of Taste [1766], This Too a Philosophy of History, and On the Cognition and Sensation). Let us call them together his principle of radical mental difference.