Charles J. Callan's 'Moral Theology' stands as a magisterial work that delves deeply into the ethical foundations and implications of Catholic doctrine as synthesized by the Angelic Doctor, St. Thomas Aquinas. With an incisive and systematic approach, Callan elucidates the Thomistic principles that underpin moral action, providing a meticulous explication that weaves together Aquinas's rich legacy with biblical teachings. The book aligns itself squarely within the neo-scholastic movement, offering a literary style that is both rigorous in scholastic methodology and accessible to those seeking a profound understanding of Catholic moral reasoning. We find within its pages a framework that not only sheds light on moral conundrums but also remains relevant in contemporary discourse. Reverend Charles Jerome Callan, a man of profound theological insight and academic prowess, composed this comprehensive treatise to invite both clergy and laypersons into the depths of Catholic moral understanding. His scholarly background, particularly his expertise in Scripture and Thomistic thought, provided a fertile ground for this endeavor, as Callan sought to articulate and promote an orthodox yet dynamic vision of moral theology shaped by Aquinas's intellectual heritage. His purpose was not only to educate but also to inspire a lived moral experience aligned with the Catholic faith. 'Moral Theology' is thus an essential text for theologians, philosophers, and any student of Catholic moral teaching. It serves as a vital reference that compels the reader towards a deeper engagement with ethical questions, viewed through the lens of Aquinas's timeless wisdom. Scholars and practitioners of theology will find in Callan's work both a bridge to the medieval mind and a guide to applying enduring principles in a modern world. This book is especially recommended for those seeking an intellectually authentic and spiritually enriching exploration of Catholic morality.