Neither son loved the father for himself. They both were using the father for their own self-centered ends rather than loving, enjoying, and serving him for his own sake. This means that you can rebel against God and be alienated from him either by breaking his rules or by keeping all of them diligently. It 's a shocking message: Careful obedience to God's law may serve as a strategy for rebelling against God .
Timothy KellerTo preach the gospel is to show people their need for salvation against a backdrop of God's nature and the character of sin, and then present Jesus as the only remedy for what ails them and the world. In my weekly preaching in the worship services I always call people to believe in Christ.
Timothy Keller