How do we know that repentance is important for Christians?

Repentance is of utmost importance for Christians because it signifies a return to a right relationship with God. In the parables from Luke 15, we see that heaven rejoices over one sinner who repents, indicating that repentance is valued by God. Furthermore, the act of repenting reveals an understanding of God's holiness and our unworthiness, leading to deeper faith and reliance on His grace. This act is essential for growth in the Christian faith, enabling believers to experience God's joy and forgiveness.