A great primer on continual doctrinal development from Scripture. The first three chapters are taken from the Hayward Lectures at Acadia Divinity School given by Marshall. The last two chapters are responses provided by respected theologians Kevin Vanhoozer and Stanley Porter. While far from exhaustive, this book establishes both a biblically faithful and intellectually satisfying starting point for hermeneutics and contemporary issues. The leading question that concerns Marshall is: "Can we go on developing doctrine beyond what we find has already happened in Scripture?" (p 55). Marshall's answer, along with his interlocutors, is "Yes." Not only can we, but we must if theology is to remain relevant to modern concerns. This does not mean, however, that the Bible becomes putty in the hands of its nearest expositor, able to twist and contort to the desire of its every handler. Instead, Marshall aims for a "principled" approach for taking theology further than its canonical development as gleaned from Scripture's own example. In essence, Marshall believes that the Scriptures themselves provide the evidence of doctrinal development, as well as a general framework within which to do so ourselves. In response to his proposal, Vanhoozer and Porter are both stimulating and slightly critical. However, I found Vanhoozer's supplements particularly helpful, mainly as it concerned his view that doctrine is not meant solely for knowledge accumulation but rather as a trajectory towards God's wisdom for us in Christ. This includes fostering the "patterns of judgment" that the Scriptures unfold, which then empower modern disciples to make similar "judgments" although in different situations. Highly recommended.