Emotion is a feeling state that encysts identity while desire is a feeling state that expels identity. This is a structural distinction, like that between fermions and bosons. You cannot escape from identification with your emotions, whether you want to or not, so that identification seems as if it is itself a kind of emotion. While desire is never actually accomplished is always in some measure a desire to desire. This is also why it is comparatively easy to disidentify from desire, to detach from it, and also why there is a tendency to parade identification with desire as if it were something to be proud of - in fact it is an endless task of reconfiguration - desire escapes like mercury. In the same way, there is a certain pride that is taken in detachment from emotion - which is entirely bogus, a matter of bad faith, of masking one emotion with another or of substituting desire for emotion.