The selections included in this anthology, drawn from a variety of Aquinas' works, focus on the roles of reason and faith in philosophy and theology. Expanding on these themes are Aquinas' discussions of the nature and domain of theology; the knowledge of God and of God's attributes attainable through natural reason; the life of God, including God’s will, justice, mercy, and providence; and the principal Christian mysteries treated in theology properly speaking—the Trinity and the Incarnation.