This book presents a comparative approach to the virtue of 'Love of God'; it is a mystical analysis based on Islamic and Christian moral theologies. This study provides an exposition and comparative analysis of Kashani's (1598-1680) and Malebranche's (1638-1715) conception of virtue, with particular attention paid to the role of love of God. One of the main goals of this research is to develop an understanding of the notion of love of God within the philosophical and mystical contexts of two different thinkers, each from a particular traditional horizon. This entails explicating each thinker's understanding of this concept within his specific line of thought in Islam or Christianity, and then situating his view within a broader philosophical and mystical perspective.