Matthew 20:15–16

God chooses whom He wills. 

He shows no partiality and all who believe in the gift of salvation given in Jesus Christ, will be saved.

Matthew 20:15–16

15 Is it not lawful for me to do what I wish with my own things? Or is your eye evil because I am good?’ 16 So the last will be first, and the first last. For many are called, but few chosen.”

The parable of the vineyard workers portrays God’s gracious generosity. Faithlife Bible.

The first workers complained that their wages were the same as those who had been hired late in the day. However, the owner had not cheated them; everyone received the agreed-upon sum for his work. The early workers grumbled because they were evil in their outlook; their master, however, was sovereignly generous.

In the context of Matthew, the workers with the contract represent Israel; they had the promises and the covenants. Those without an agreement represent the Gentiles, who would be made equal with the Jewish people when salvation became available to all through faith in Jesus Christ. NKJ Bible.

The direct object of this parable seems to be, to show that though the Jews were first called into the vineyard, at length the gospel should be preached to the Gentiles, and they should be admitted to equal privileges and advantages with the Jews. The parable may also be applied more generally, and shows, 1. That God is debtor to no man. 2. That many who begin last, and promise little in religion, sometimes, by the blessing of God, arrive at a great deal of knowledge, grace, and usefulness. 3. That the recompense of reward will be given to the saints, but not according to the time of their conversion. It describes the state of the visible church, and explains the declaration that the last shall be first, and the first last, in its various references. Matthew Henry Commentary.

Matthew 19:30 But many who are first will be last, and the last first.