What does the parable of the elder son teach about grace?

The parable of the elder son in Luke 15 highlights the nature of divine grace, which extends beyond human merit. The elder son, despite his years of diligent service, fails to understand that the father's love and acceptance are not based on his works. This demonstrates that God's grace is freely given and not contingent on individual behavior. As the father stated, 'all that I have is thine,' emphasizing that the blessings of God are rooted in relationship rather than performance. God's acceptance is not a reward for good deeds, but a gift extended to those who repent, regardless of their past.