This major new work provides a critical study of the main Christian doctrines as understood and explained by Thomas Aquinas. The Thomistic revival of the last century focused almost exclusively on Aquinas as the Christian philosopher and produced books and articles discussing issues such as his understanding of being, epistemology and natural theology. However, little has been done, even to this day, to examine Aquinas' teaching on the major Christian doctrines such as the Trinity, Incarnation, creation, salvation, sacraments, church and eschatology. This book of essays, authored by an international team of recognized Thomistic scholars, will greatly help to fill this gap. The essays will be beneficial not only for scholars but also for those wanting a clear introduction to the doctrinal thought of Thomas. As a result, it is destined to become indispensable to every theological library.