We know why nine people were murdered in Charleston. We know why sex-trafficking thrives. We know why we cheat on our spouses. The reason for all that is wrong in the world is summed up in one word — sin.

Reformed theology is theology in process. Semper reformanda, we say — always reforming. As a body of thought, Reformed theology is not complete. The challenge and opportunity for Christians is not to revise the biblical principles but to make…