The point of the parable was that God will graciously do more for some of those who work for Him than His justice demands. [source][source][source]
In view of the context, the12disciples correspond to the workers hired at the beginning of the day, the beginning of Jesus" public ministry. Those hired later correspond to other people who became Jesus" disciples later in His ministry. One of these people might have been the rich young man if he had become a disciple ( Matthew 20:16-22). Peter"s question about what the Twelve would receive ( Matthew 20:27) had implied that they should receive a greater reward since their sacrifice had been greater. This parable taught him that God would give him a just reward for his sacrificial labor for Jesus. Nonetheless God had the right to give just as great reward to those whose service was not as long. This parable taught the disciples not to think of heavenly rewards in terms of justice, getting in proportion to what they deserved. They should think of them in terms of grace, any reward being an act of God"s grace. Even those hired early in the day received a reward, and the landowner had been gracious and generous in hiring them and not others. [source][source][source]
Modern disciples of Jesus should view heavenly rewards the same way. The only reason we will receive any reward is that God has called us to be His workers. We can count on God dealing with us justly, graciously, and generously whether we serve God all our lives or only a short time having become His disciples later in life. [source][source][source]
"The parable is emphasizing a right attitude in service." [1][source]
This parable does not teach that God will reward all His disciples equally. Other parables also teach that He will not (e.g, Matthew 25:14-30). The point of this one is that God will reward all His disciples justly, graciously, and generously. In some cases the last called will be among the first in rank of blessing. Conversely in some cases those whom God called early in their lives may not receive as much reward as those called later in life. [source][source][source]
Jesus was probably hinting at more in this parable. At least we can draw the following applications from it. Disciples in Jesus" day would not necessarily receive more reward than disciples whom God calls to serve Him just before the day of laboring ends, before His second coming. Neither would Jewish disciples necessarily receive more than Gentile disciples whom God calls later in His program of preparation for the kingdom (cf. 1 Corinthians 6:2; Revelation 2:26). [source][source][source]
Context Summary
Matthew 20:1-16 - The Bargaining Spirit Rebuked
This parable originated in Peter's question. He had seen the rich young man go away sorrowful, because he could not meet the test which had been put to him; and he contrasted with that great refusal the swift willingness with which he and his fellow Apostles had left all to follow the Lord Jesus.
"Take care," said Jesus, "or your bargaining for the rewards of the Kingdom, will put you down among the lowest; while they who don't bargain will come out at the top." The last made no agreement; they came in at the eleventh hour, and were only too glad to take the vineyard path, leaving the vine owner to give what he thought right. The first "agreed," taking care to strike a bargain of so much money for so much work. But they would have done better if they had left the payment to the grace of their employer. "For this cause it is of faith, that it may be according to grace, to the end that the promise may be sure to all the seed," Romans 4:16, r.v. [source]
Chapter Summary: Matthew 20
1Jesus, by the parable of the laborers in the vineyard, shows that God is debtor unto no man; 17foretells his passion; 20by answering the mother of Zebedee's children, teaches his disciples to be humble; 29and gives two blind men their sight
Greek Commentary for Matthew 20:16
The last first and the first last [οι εσχατοι πρωτοι και οι πρωτοι εσχατοι] The adjectives change places as compared with Matthew 19:30. The point is the same, though this order suits the parable better. After all one‘s work does not rest wholly on the amount of time spent on it. “Even so hath Rabbi Bun bar Chija in twenty-eight years wrought more than many studious scholars in a hundred years” (Jer. Berak. ii. 5c). [source]
Greek Commentary for Matthew 20:16
The adjectives change places as compared with Matthew 19:30. The point is the same, though this order suits the parable better. After all one‘s work does not rest wholly on the amount of time spent on it. “Even so hath Rabbi Bun bar Chija in twenty-eight years wrought more than many studious scholars in a hundred years” (Jer. Berak. ii. 5c). [source]
Reverse Greek Commentary Search for Matthew 20:16
This saying was repeated many times (Matthew 19:30; Mark 10:31; Matthew 20:16). [source]
Regarding all whom he addressed as subjects of saving grace. The term corresponds to the Old-Testament title of Jehovah's people: Isaiah 65:9, Isaiah 65:15, Isaiah 65:22; Psalm 105:43. Compare Matthew 20:16; Matthew 22:14; Romans 8:33. [source]