How Biblical Theology Works

By contrast, biblical theology, by and large, asks and answers questions that focus on the contributions and themes of particular biblical books and corpora as these books and corpora are stretched out across the timeline of redemptive history. As much as possible, the categories used are the categories found within the biblical materials themselves.

--D.A. Carson and Timothy Keller, "Gospel-Centered Ministry," in The Gospel as Center: Renewing Our Faith and Reforming Our Ministry Practices (edited by D.A. Carson and Timothy Keller; Wheaton, IL: Crossway, 2012), 19.