Jesus' question about the two sons can be easily answered…it is the repentant son who is the obedient son. The first son, although he at first rejects the father's will, is the true heir of the father. The "other son" (Israel) quickly agreed to work for the father, but "did not go." Like Israel, the "other son" rejected work in the father's vineyard (kingdom). Because of Israel's disobedience, they were unable to be the father's heir. They were unable to work in the kingdom. There are times that our stubborn refusal to change our behavior are just as obstinate. In God's kingdom, only those who accept the will of God and repent are welcomed. The challenge is to be repentant of those obstacles which keep us from maturity in Christ. What kept the religious leaders from accepting Jesus? What keeps us from more fully accepting Jesus? Why is it so comfortable to be a "Sunday morning" Christian? What is keeping us (obstacles) from a maturing relationship to Christ?