 It is not uncommon for contemporary philosophers to see sentimentalism as a theory of moral judgment or facts. But classical sentimentalists considered the primary question to be a moral psychological one: What feature of human nature – reason, sentiment, or intellectual intuition – explains why we approve of something or blame someone? (See David Hume’s Treatise of Human Nature (T), 456 and Adam Smith’s The Theory of Moral Sentiments (TMS), 312–313.) Some of their main arguments were introduced in the context of this explanatory question, which lies on the border between philosophy and what is now the empirical science of psychology.