This sermon on the sixth commandment lays the groundwork for why murder is a sin by demonstrating that first, murder is a sin because God is life. Secondly, murder is an attack on God's image bearer. Contrasting instrumental value with intrinsic value, murder is always wrong, no matter how it manifests itself whether in anger towards a brother, abortion or euthanasia. But none of these are the worst possible sin. The worst possible sin is the murder of the Son of God. His death on the cross for sinners makes forgiveness of sin, including the sin of murder possible and available.