The nature of sin all boils down to this...

Our sinful nature all boils down to our claim to serve ourself and not God. Whenever we make a choice that is contrary to God's will, we in essence are makeing a claim to make our own decisions based on how it will effect ourself. While sin is inherant based on the sin of Adam, sin that leads to condemnation is only through a result of rejection of the claims of the Son of God for His sacrifice for our redemption. Here Jesus says you are not your own, but were bought with a price. Anyone who receives Him will not be condemned on that Day.