What can we learn from the elder brother in the parable?

The elder brother in the parable of the prodigal son exemplifies those who believe they merit God's favor through their works. His resentment towards the father's celebration of the prodigal son's return reveal a heart that fails to understand the depth of grace. Despite his faithfulness, he does not recognize his own need for grace, believing he has earned his position through works. This illustrates a warning against self-righteousness and the danger of viewing salvation as a transaction. Instead, the narrative calls believers to celebrate grace freely given, acknowledging that all stand in need of God's mercy, reinforcing the Reformed doctrine that salvation is by grace alone through faith alone.