Here we must confess what St. Paul says in Rom. 5:12, namely, that sin had its origin in one man, Adam, through whose disobedience all men were made sinners and became subject to death and the devil. This is called original sin, or the root sin.
The fruits of this sin are the all the subsequent evil deeds which are forbidden in the Ten Commandments, such as unbelief, false belief, idolatry, being without the fear of God, presumption, despair, blindness—in short, ignorance or disregard of God—and then also lying, swearing by God’s name, failure to pray and call upon God, neglect of God’s Word, disobedience to parents, murder, unchastity, theft, deceit, etc.
This hereditary sin is so deep a corruption of nature that reason cannot understand it. It must be believed because of the revelation in the Scriptures.
– Martin Luther, The Smalcald Articles. Part III, Article I: On Sin