And he said unto him, Son, thou art ever with me, and all that I have is thine.

People's New Testament

15:31 Son. The father pleads with the envious brother and tries to bring him to a better frame of mind, as Christ pleads with Israel.

All that I have is thine. If a son, then an heir, and a joint heir with Christ (Ro 8:17).

Wesley's Notes

15:31 Thou art ever with me, and all that I have is thine - This suggests a strong reason against murmuring at the indulgence shown to the greatest of sinners. As the father's receiving the younger son did not cause him to disinherit the elder; so God's receiving notorious sinners will be no loss to those who have always served him; neither will he raise these to a state of glory equal to that of those who have always served him, if they have, upon the whole, made a greater progress in inward as well as outward holiness.

Jamieson-Fausset-Brown Bible Commentary

31. Son, &c.-The father resents not the insult-how could he, after the largeness of heart which had kissed the returning prodigal? He calmly expostulates with him, "Son, listen to reason. What need for special, exuberant joy over thee? Didst thou say, 'Lo, these many years do I serve thee?' In that saidst thou truly; but just for that reason do I not set the whole household a-rejoicing over thee. For thee is reserved what is higher still-a tranquil lifelong satisfaction in thee, as a true-hearted faithful son in thy father's house, nor of the inheritance reserved for thee is aught alienated by this festive and fitting joy over the once foolish but now wise and newly recovered one."

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.