How does Psalm 51 illustrate the concept of original sin?

David's confession in Psalm 51 that he was 'shapen in iniquity' reflects the theological concept of original sin—the idea that all humans inherit a corrupted sinful nature due to Adam's fall. This doctrine is foundational in Reformed theology, emphasizing that sin is not merely a collection of actions but a state of being that affects every individual. David’s awareness of his own inherent sinfulness is a crucial element of his repentance, situating the need for a Savior who provides righteousness in place of the guilt inherited from Adam. This understanding informs not only personal reflection but the broader historical and theological significance of human sinfulness before a holy God.