Here's Michael Lawrence from his new book Biblical Theology in the Life of the Church: A Guide for Ministry (IX Marks; Crossway, 2010):
"But here at the start, I want to make the point that the most practical thing we can do, the most important tool we need in ministry, is biblical theology. And I mean that in both senses of the phrase. Learning how to do biblical theology is no mere academic exercise. No, it's vital to you work as a pastor or church leader. It shapes your preaching, your counseling, your evangelizing, , your ability to engage wisely with culture, and more. You will not be a very good theologian, which means you will not be a very good pastor, if you do not learn how to do biblical theology" (15, italics original).