Kolb, Robert. The Book of Concord: The Confessions of the Evangelical Lutheran Church. Minneapolis: Fortress Press, 2000.
Augsburg Confession XIX, “Concerning the Cause of Sin.” p. 53
Apology to the Augsburg Confession XIX, “The Cause of Sin.” p. 235
Article 19 of the Augsburg Confession says, in short, that all sin is a perversion of God’s good work of creation and preservation. It is the will of the devil and of the ungodly to sin, in accord with their nature. The apology confirms that the Roman opponents accept article 19, and restates it very briefly.