What does Aquinas have to teach us on the topic of peace? Looking over the scholarly literature, one would think very little. Most Thomists ignore Aquinas’s thought on peace. Most peace researchers summarily dismiss Aquinas. Peace in the Thought of Thomas Aquinas challenges both these trends and offers the first book length study of peace in Aquinas’s thought. John Meinert outlines Aquinas's historical predecessors, then provides an exposition and interpretation of the full scope of Aquinas's thought on peace: metaphysics, Trinitarian theology, Christology, Pneumatology, ecclesiology, natural theology, ethics, and sacramental theology. What emerges from this extended study is a new vision of Aquinas’s work. Peace in the Thought of Thomas Aquinas establishes Aquinas as an indispensable dialogue partner for anyone thinking rigorously about the theology, philosophy, and ethics of peace. As Aquinas himself says, “observe peace and you will come to salvation.”