Fear, joy, grief, love, hate, pride, shame. We all have emotions, and we recognize emotions in others. But do we really understand what emotions are and what they signify? It is remarkable how often we are wrong about our own emotions and misread the emotions of others. We also deceive ourselves about their meaning. The more we puzzle over the nature of emotions, the deeper the mystery becomes. It is a mystery that is by no means solved, but one that repays careful, philosophical analysis.