In this volume, Fr. Franck Quoëx responds to Joseph Ratzinger's call for a renewed appreciation of liturgical rite. A student of Pierre Gy, OP, he brings to this study of Aquinas's liturgical theology a rare combination of expert knowledge of liturgical sources and history and the best of modern historical-critical research guided by sound theological judgment. Fr. Quoëx frames his study with an overview of the problem of rite in modern theological-anthropological discourse, before turning to Aquinas' theory of worship in the treatise on the virtue of religion. He then explores Aquinas' doctrine on the cultic dimensions of the Eucharist and other sacraments in his sacramental theology more broadly, finishing with a close study of the mass commentary of the Tertia Pars. Although there has been increasing attention to Thomas's treatment of religion as a virtue, none have approached him from an anthropological angle with a focus on the nature of liturgical rite, or fully exploited the perspectives of liturgical scholarship to shed light on sacramental theology. Quoëx's work, as the work of a Thomist, liturgist, and medievalist well versed in medieval liturgical development and in the genre of often-allegorical liturgical commentary, opens up this crucial but neglected facet of Aquinas' theological synthesis. Few books have been published on Aquinas's liturgical theology. Now that interest in Aquinas's virtue theory and sacramental theology is growing rapidly, Quoëx's studies are an invitation to further reflection on the topic of Aquinas's liturgical theology with its manifold ramifications for and connections with other theological topics in his Summa, including his theological anthropology, his soteriology, his treatment of the Old and New Laws, and his account of the virtue of religion in connection with the other virtues.