Jesus tells a parable that is really more like an allegory showing us all that God has done for us, and despite all that God has done; given us creation, put us in paradise, sent the prophets after our fall, and finally His Own Son, whom instead of accepting, we crucified. God askes in the first reading; "What more could I have done?" Isaiah's parable in the first reading, is the basis of Jesus' in the Gospel, and both Isaiah and Jesus say that the purpose of our lives is to bear fruit, works of Justice. Justice is Love's minimum requirement. But God goes beyond Justice and Loves completely. We too, are invited by His Grace to do the same; Love and bear fruit.