Book excerpt: Love Become Incarnate is a Festschrift in honor of Bruce D. Marshall, Lehman Professor of Christian Doctrine at Southern Methodist University’s Perkins School of Theology. Marshall is one of the most significant Catholic theologians in the English-speaking world. His work exemplifies an intentionally Catholic theology that makes fearless use of the fullness of truth—wherever it may be found—in conscious service to the Church. Marshall has made significant contributions to the doctrine of the Trinity, Christology, Pneumatology, ecclesiology, ecumenism, Jewish-Christian dialogue, and fundamental theology. St. Thomas Aquinas has been his most constant theological companion, although he has also advanced our understanding of Saints Augustine and Anselm, John Duns Scotus, Martin Luther, Matthias Joseph Scheeben, Karl Barth, and other major figures. Marshall has carefully developed a unique, powerful, and wide-ranging theology of the primacy of Christ over all things. It is this same Christ who is the love of God become incarnate. This series of essays by Marcia Colish, J. Augustine Di Noia, Paul Griffiths, Reinhard Hütter, Matthew Levering, and others engage and advance Marshall’s ranging contributions to historical and systematic theology.