Tim Keller tackles the issue of executing authentic sermon application by asking two related questions: the positive, how do people change? the negative, what causes people to sin? The answer to both, Keller says, is articulated in the reformed doctrine of sanctification by faith. First, real change (towards ‘actual’ righteousness) is a result of feeding on (faith in) imputed righteousness; second, individual sins are individual acts of forgetting what God has done for us in Christ and feeding on something else (an idol).
Keller Project: The doctrine of authentic sermon application?