Sound Sentiments seeks to open a new path in the philosophy of emotion. The focus of most recent work on the philosophy of emotion has been on the nature of emotion, with some attention also to the relation of emotion to ethics. This book explores the idea that emotions admit of valuation, of degrees of adequacy. What does it mean for emotion to be well-constituted? What distinguishes good feeling from (just) feeling good? Is there such a distinction at all? The answer to these questions becomes clearer if we realise that for an emotion to be all it seems, it must be responsible as well as responsive to what it is about.