Nearly everyone defines sin as breaking a list of rules. Jesus, though, shows us that a man who has violated virtually nothing on the list of moral misbehaviours can be every bit as spiritually lost as the most profligate, immoral person. Why? Because sin is not just breaking the rules, it is putting yourself in the place of God as Saviour, Lord, and Judge just as each son sought to displace the authority of the father in his own life.
Tim Keller, The Prodigal God