By Grace Alone – He Receives Sinners
Pastor Tan Thai · May 22, 2021
This sermon analyzes the parable of the prodigal son in Luke 15, focusing on the elder brother as a symbol of lostness through self-righteousness. Jesus teaches that there are two paths to alienation from the Father: living in obvious sin and living in pride over one's own moral achievements.
The sermon opens with the context of Luke 15: tax collectors and sinners drawing near to Jesus to hear him teach, while the Pharisees and scribes grumble because he associates and eats with them. In response, Jesus tells three parables about lostness: the lost sheep, the lost coin, and the lost son. All three are intended to introduce a new and deeper understanding of what it means to be spiritually lost.
The theological core of the sermon is the contrast between the two sons. The younger son committed obvious sins of the flesh, but the elder son commits sins of the soul through pride and self-righteousness. Both are alienated from the father's heart because both want to control the father's estate without truly loving him. Jesus ends the story with the younger son saved after repenting, while the elder son remains outside in anger, refusing to enter the feast — revealing two paths to spiritual lostness: living in sin and living in self-salvation through moral achievement.
The sermon identifies three marks of elder-brother lostness: first, an undercurrent of anger rooted in the belief that God owes them a good life because of their obedience; second, duty without beauty — obeying God as a means to an end rather than out of love, making all spiritual disciplines a grind with no joy; third, religious and social superiority, looking down on those perceived as morally or socially inferior. These marks can be present even in people whose outward lives appear thoroughly religious and moral.
The solution to elder-brother lostness is not trying harder but looking at the radical vulnerability of Jesus Christ on the cross. The cross both humbles and affirms: it declares that you are so lost that nothing less than the death of the Son of God can save you, yet at the same time it declares that he was glad to do it. Only when a person truly receives this grace can they be freed from self-righteousness and enter the feast of salvation.
The application calls the congregation not to stand outside like the elder brother but to enter the feast and live out the gospel by loving the poor, the broken, and the marginalized. Because Jesus, the ultimate insider within the Trinity, was cast out so that absolute outsiders could be brought in, those who believe in him must reflect that love in their relationships with all people, regardless of class or circumstance.