Is the death penalty for sin unjust? By no means. Remember that God voluntarily created us. He gave us the highest privilege of being His image bearers. He made us but a little lower than the angels. He freely gave us dominion over all the earth. We are not turtles. We are not fireflies. We are not caterpillars or coyotes. We are people. We are the image bearers of the holy and majestic King of the cosmos. We have not used the gift of life for the purpose God intended. Life on this planet has become the arena in which we daily carry out the work of cosmic treason. Our crime is far more serious, far more destructive than that of Benedict Arnold. No traitor to any king or nation has even approached the wickedness of our treason before God. Sin is cosmic treason. Sin is treason against a perfectly pure Sovereign. It is an act of supreme ingratitude toward the One to whom we owe everything, to the One who has given us life itself. Have you ever considered the deeper implications of the slightest sin, of the most minute peccadillo? What are we saying to our Creator when we disobey Him at the slightest point? We are saying no to the righteousness of God. We are saying, ‘God, Your law is not good. My judgment is better than Yours. Your authority does not apply to me. I am above and beyond Your jurisdiction. I have the right to do what I want to do, not what You command me to do.’ The slightest sin is an act of defiance against cosmic authority. It is a revolutionary act, a rebellious act in which we are setting ourselves in opposition to the One to whom we owe everything. It is an insult to His holiness. We become false witnesses to God. When we sin as the image bearers of God, we are saying to the whole creation, to all of nature under our dominion, to the birds of the air and the beasts of the field: ‘This is how God is. This is how your Creator behaves. Look in his mirror; look at us, and you will see the character of the Almighty.’ We say to the world, ‘God is covetous; God is ruthless; God is bitter; God is a murderer, a thief, a slanderer, an adulterer. God is all of these things that we are doing.’
R.C. Sproul, The Holiness of God (Wheaton: Tyndale, 1985), 115-16.