Thomas Aquinas’s theological system (Thomism) has influenced those inside—and outside—the church for more than seven hundred years. Yet while innumerable introductions to and analyses of his thought are available, none provide a thoroughly and consistently Reformed critique. Scott Oliphint’s unique engagement with Thomas Aquinas brings the works of Geerhardus Vos and Cornelius Van Til to bear on his thought. Overarching analysis focuses in particular on Aquinas’s dualistic approach to the natural and revealed knowledge of God and his use of Aristotelian metaphysics. Oliphint then responds to this methodology in terms of historic Reformed thought and the doctrines of revelation and Scripture. Pastors, theologians, philosophers, and students will benefit from Oliphint’s clear, precise, and efficient analysis—and forceful critique.