A compelling analysis tying the work of Aquinas to contemporary literature on virtueDespite heightened attention to virtue contemporary philosophical and theological literature has failed to offer detailed analysis of how people attain and grow in the good habits we know as the virtues. Though popular literature provides instruction on attaining and growing in virtue it lacks careful scholarly analysis of what exactly these good habits are in which we grow.Growing in Virtue is the only comprehensive account of growth in virtue in the thought of Thomas Aquinas. Mattison offers a robust account of habits including what habits are why they are needed and what they supply once possessed. He draws on Aquinas to carefully delineate the commonalities and differences between natural acquired virtues and graced infused virtues. Along the way Mattison discusses the distinction between disposition and habit the role of custom in virtue formation the nature of virtuous passions the distinct contribution of the gifts of the Holy Spirit to graced life explanations for persistent activity after the loss of virtue and the possibility of coexistence of the infused and acquired virtues in the same person. For readers interested in virtue and morality from a philosophical perspective and scholars of theological ethics and moral theology in particular Mattison offers compelling arguments from the work of Aquinas explicitly connected to contemporary scholarship in philosophical virtue ethics.