We can all learn from Keller’s approach. I am grateful for the constant reminder in his writings that moralizing can be just as sinful as immorality, and that sin is a multiplex and multi-faceted reality. But unless I am on firm ground in my definitions, I will mislead in my presentation of the gospel. Ultimately, the gospel is not about me at all. It is certainly for me, but it is about the God whom I have offended, and about the Christ whom he punished in my place.