It was meet that we should make merry, and be glad: for this thy brother was dead, and is alive again; and was lost, and is found.

People's New Testament

15:32 This thy brother. If a son, then the returned sinner is his brother. Unless he, too, can welcome him, then he is the lost son. Stier says:

Those who object to all use of fiction must explain, as best they may, this story, for such it is. There is not even an application attached to it; the reader is left to make that for himself. As a representation of redeeming love it has been well called the Gospel in the Gospel. In comparison with others, it is the Crown and Pearl of all parables.''

Wesley's Notes

15:32 This thy brother was dead, and is alive - A thousand of these delicate touches in the inspired writings escape an inattentive reader. In Lu 15:30, the elder son had unkindly and indecently said, This thy son. The father in his reply mildly reproves him, and tenderly says, This thy brother - Amazing intimation, that the best of men ought to account the worst sinners their brethren still; and should especially remember this relation, when they show any inclination to return. Our Lord in this whole parable shows, not only that the Jews had no cause to murmur at the reception of the Gentiles, (a point which did not at that time so directly fall under consideration,) but that if the Pharisees were indeed as good as they fancied themselves to be, still they had no reason to murmur at the kind treatment of any sincere penitent. Thus does he condemn them, even on their own principles, and so leaves them without excuse. We have in this parable a lively emblem of the condition and behaviour of sinners in their natural state. Thus, when enriched by the bounty of the great common Father, do they ungratefully run from him, Lu 15:12. Sensual pleasures are eagerly pursued, till they have squandered away all the grace of God, Lu 15:13. And while these continue, not a serious thought of God can find a place in their minds. And even when afflictions come upon them, Lu 15:14, still they will make hard shifts before they will let the grace of God, concurring with his providence, persuade them to think of a return, Lu 15:15,16. When they see themselves naked, indigent, and undone, then they recover the exercise of their reason, Lu 15:17. Then they remember the blessings they have thrown away, and attend to the misery they have incurred. And hereupon they resolve to return to their father, and put the resolution immediately in practice, Lu 15:18,19. Behold with wonder and pleasure the gracious reception they find from Divine, injured goodness! When such a prodigal comes to his father, he sees him afar off, Lu 15:20. He pities, meets, embraces him, and interrupts his acknowledgments with the tokens of his returning favour, Lu 15:21. He arrays him with the robe of a Redeemer's righteousness, with inward and outward holiness; adorns him with all his sanctifying graces, and honours him with the tokens of adopting love, Lu 15:22. And all this he does with unutterable delight, in that he who was lost is now found, Lu 15:23,24. Let no elder brother murmur at this indulgence, but rather welcome the prodigal back into the family. And let those who have been thus received, wander no more, but emulate the strictest piety of those who for many years have served their heavenly Father, and not transgressed his commandments.

Jamieson-Fausset-Brown Bible Commentary

32. It was meet-Was it possible he should simply take his long vacant place in the family without one special sign of wonder and delight at the change? Would that have been nature? But this being the meaning of the festivity, it would for that very reason be temporary. In time, the dutifulness of even the younger son would become the law and not the exception; he too at length might venture to say, "Lo, these many years do I serve thee"; and of him the father would say, "Son, thou art ever with me." In that case, therefore, it would not be "meet that they should make merry and be glad." The lessons are obvious, but how beautiful! (1) The deeper sunk and the longer estranged any sinner is, the more exuberant is the joy which his recovery occasions. (2) Such joy is not the portion of those whose whole lives have been spent in the service of their Father in heaven. (3) Instead of grudging the want of this, they should deem it the highest testimony to their lifelong fidelity, that something better is reserved for them-the deep, abiding complacency of their Father in heaven.

Matthew Henry's Concise Commentary

15:25-32 In the latter part of this parable we have the character of the Pharisees, though not of them alone. It sets forth the kindness of the Lord, and the proud manner in which his gracious kindness is often received. The Jews, in general, showed the same spirit towards the converted Gentiles; and numbers in every age object to the gospel and its preachers, on the same ground. What must that temper be, which stirs up a man to despise and abhor those for whom the Saviour shed his precious blood, who are objects of the Father's choice, and temples of the Holy Ghost! This springs from pride, self-preference, and ignorance of a man's own heart. The mercy and grace of our God in Christ, shine almost as bright in his tender and gentle bearing with peevish saints, as his receiving prodigal sinners upon their repentance. It is the unspeakable happiness of all the children of God, who keep close to their Father's house, that they are, and shall be ever with him. Happy will it be for those who thankfully accept Christ's invitation.