What kind of affective phenomenon is religious zeal and how does it relate to other affective phenomena, such as moral anger, hatred, and love? In this paper, I argue that religious zeal can be both, and be presented and interpreted as both, a love-like passion and an anger-like emotion. As a passion, religious zeal consists of the loving devotion to a transcendent religious object or idea such as God. It is a relatively enduring attachment that is constitutive of who the (...) zealot is, and it expresses itself in a distinctive set of mental and behavioral dispositions. Most importantly, it motivates uncompromising actions and involves intense, hot, and deep emotions. As an anger-like emotion, religious zeal is an occurrent affective state of mind that is intentionally directed towards a specific object, characteristically a person or group of persons. It condemns the violation of a religious norm that is taken to be of absolute validity and general applicability. It motivates an action aiming at vengeance and retaliation, and it involves intense and hot feelings of hostility towards its object. I argue that rather than reducing the complex phenomenon of religious zeal to one of these two manifestations, we should reflect upon the question of how the two distinct conceptualizations relate to each other. (shrink)