 Relatedly, for Smith but not for Hume there is a lot to learn about what sentiments we should have. In neither the Treatise nor the second Enquiry does Hume spend any significant time on how we might learn to acquire new sentiments or alter the ones we have. By contrast, the first five parts of TMS—almost two-thirds of the text—are devoted to a delineation of the various ways in which we learn to assess our sentiments, and in which learning to assess them enables us both to express them with propriety, and to change them.