In this major contribution to contemporary theological and philosophical debates, Matthew Levering bridges the gap between scriptural and metaphysical approaches to the triune God. Levering's argument rests upon St. Thomas Aquinas's understanding of theology as contemplative wisdom. Taking us through Aquinas's theology of God as One and Three, he demonstrates that Trinitarian theology should be a spiritual exercise assisting our movement from self- to God-centeredness. Crucial to the spiritual exercise is the contemplative appropriation of biblical revelation, which, Levering argues, has to be joined to a correspondingly rich metaphysical analysis if the "God" who is revealed is to be understood in a non-idolatrous fashion. In chapters that broadly follow the structure of Aquinas's treatise on God in his Summa Theologiae, Levering engages with a wide range of contemporary theologians, biblical exegetes, and philosophers.