Systematic Theologies are not the most exciting reads. Joshua Harris seeks to change that with his book Dug Down Deep: Building Your Life on Truths that Last. This is a systematic theology for the average person. Harris sticks to the essentials: doctrine of God, Christ, the Spirit, Scripture, Salvation, Sanctification and the Church. For the most part he avoids controversial areas, though for some the essentials of the Christian faith can be controversial.
One thing that sets this apart from most (not all) books of this kind is that theology is not seen as abstract. He begins with the notion, similar to John Frame, that truth is to be lived. It is a foundation for our lives, providing stability in the storms of life (as Harris notes from the end of the Sermon on the Mount).
“Theology matters, because if we get it wrong, then our whole life will be wrong.”
Another thing that sets this apart from just about every systematic theology I’ve read is the use of narrative to explain or illustrate the importance of particular doctrines. It is similar to the work his friend Don Miller has done, but not nearly as funny. He even has a few hand-drawn illustrations in his section on sanctification. So this is far more interesting than Berkof or just about any systematic theology.