What is sin? I’ve often heard sin defined as missing the mark, as if one were missing a target he is aiming at. Those whose lives are centered on sin not only offend God, but utterly miss the precious gift of His eternal purpose. The Bible says that sin is lawlessness. And It makes perfectly clear what the sins of the flesh are—often warning that those corrupted by a lifestyle of sin have no inheritance in the kingdom of God.
But we see in Scripture conflicting opinions about what causes sin, and thus its remedy. The Jewish leaders viewed sin as being the product of a person’s outward behavior. So they attempted to manage sin through a system of rules which grew more and more burdensome as time went by. Jesus, on the other hand, realized that sin is rooted in man’s heart. God was about to deal with the problem of sin in a whole new way.
From Free from the Power of Sin: the Keys to Growing in God in Spite of Yourself