Why is repentance important in the story of the lost sheep?

In the story of the lost sheep, repentance is highlighted as a central theme demonstrating the necessity of turning away from sin and returning to God. Verse 7 of Luke 15 states, ‘there will be more joy in heaven over one sinner who repents than over ninety-nine righteous persons who need no repentance.’ This emphasizes not only the seriousness of being lost but also the celebration that ensues in heaven when a sinner repents. It signifies the transformative power of God’s grace in the life of a believer, affirming that repentance is a crucial step in the journey of faith and relationship restoration with God.