1. Christ, who uses Gentiles for world evangelization (Mt 20:10-16)
    The Jews who received the gospel first felt proud, but they did not know that Jesus was the Christ, the heart of the gospel. So the blessing of world evangelization was passed on to the Gentiles.
    Lk 17:16-18, Acts 10:45, Acts 13:46, Acts 18:6, Acts 28:25-28

In the parable of the laborers in the vineyard, Jesus said that the Jews who received the gospel first were last, and the Gentiles who received the gospel last were first. This is because the Jews who received the Gospel first did not know the core of the Gospel, that Jesus is the Christ. (Mt 20:10-16)

Mt 20:10 But when the first came, they supposed that they should have received more; and they likewise received every man a penny.
11 And when they had received it, they murmured against the goodman of the house,
12 Saying, These last have wrought but one hour, and thou hast made them equal unto us, which have borne the burden and heat of the day.
13 But he answered one of them, and said, Friend, I do thee no wrong: didst not thou agree with me for a penny?
14 Take that thine is, and go thy way: I will give unto this last, even as unto thee.
15 Is it not lawful for me to do what I will with mine own? Is thine eye evil, because I am good?
16 So the last shall be first, and the first last: for many be called, but few chosen.

Jesus healed ten lepers. But only the Gentiles among those lepers gave thanks to Jesus. (Lk 17:16-18)

Lk 17:16 And fell down on his face at his feet, giving him thanks: and he was a Samaritan.
17 And Jesus answering said, Were there not ten cleansed? but where are the nine?
18 There are not found that returned to give glory to God, save this stranger.

The Holy Spirit was poured out on Gentiles who believed in Jesus as the Christ. (Acts 10:45)

Acts 10:45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.

Paul and Barnabas preached the gospel to the Jews first, but they did not receive it, so they turned to the Gentiles. (Acts 13:46, Acts 18:6)

Acts 13:46 Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.

Acts 18:6 And when they opposed themselves, and blasphemed, he shook his raiment, and said unto them, Your blood be upon your own heads; I am clean; from henceforth I will go unto the Gentiles.

After all, as the Old Testament prophesied, the Jews do not believe that Jesus is the Christ. Eventually, the message of God’s salvation is transmitted to the Gentiles. (Acts 28:25-28)

Acts 28:25 And when they agreed not among themselves, they departed, after that Paul had spoken one word, Well spake the Holy Ghost by Esaias the prophet unto our fathers,
26 Saying, Go unto this people, and say, Hearing ye shall hear, and shall not understand; and seeing ye shall see, and not perceive:
27 For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
28 Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it.