The Parable of the Prodigal Son (Luke 15:1-32) illustrates God’s joy over a repentant sinner through the stories of a lost sheep, a lost coin, and two sons. The younger son rebels squanders his inheritance and falls into despair before returning home in repentance. His father, filled with compassion, welcomes him back with a grand celebration, symbolizing God's grace. Meanwhile, the older son, resentful of his brother’s restoration, represents the self-righteous who struggle to grasp grace. The parable emphasizes that salvation is not earned but freely given, and God rejoices when the lost are found.