The word “empathy”—a rendering of the German Einfühlung, “feeling into”—is only a century old, but people have been interested for a long time in the moral implications of feeling our way into the lives of others. In “The Theory of Moral Sentiments” (1759), Adam Smith observed that sensory experience alone could not spur us toward sympathetic engagement with others: “Though our brother is upon the rack, as long as we ourselves are at our ease, our senses will never inform us of what he suffers.” For Smith, what made us moral beings was the imaginative capacity to “place ourselves in his situation . . . and become in some measure the same person with him, and thence form some idea of his sensations, and even feel something which, though weaker in degree, is not altogether unlike them.”