This Keller piece explaining the difference between good news and good advice is worth reading in full. Here is a taste:
'You know what, when you hear the gospel, when you hear a message that it’s all been done for you, that it’s a historical event that’s happened, your salvation is accomplished for you, what do you want to do? You want to obey the Ten Commandments, you want to pray, and you want to please the one who did this for you. If on the other hand, you send military advisers who say, “You’re going to have to live a really, really, good life if you want to get to heaven.” What are you going to do? You’re going to want to pray, you’re going to want to obey the Ten Commandments—it looks the same doesn’t it? [But] for two radically different reasons: one is joy; one is fear. In the end, in the short run, they look alike. But in the long run, one leads to burnout, self-righteousness, guilt and all sorts of problems. Isn’t that fascinating?'