新约时代，也是福音时代，神对人说的头一句话，就是：‘你们要悔改，因为诸天的国已经临近了’（太三2）。这是藉着施浸者约翰说的。等到主耶稣出来传道时，祂所说的头一句话还是：‘你们要悔改，因为诸天的国已经临近了’（太四17）。为什么要悔改？因为诸天的国要来；悔改就是要叫人进到诸天的国里。悔改不只是使人罪得赦免，得着生命，重生得救；悔改更是把人带进一个国度里。以后我们看见，主耶稣走遍各城各乡，在各会堂里所传讲的，不只是赦罪的福音、生命的福音，更是国度的福音（太九35）。
使徒行传给我们看见，主耶稣在复活以后，四十天之久，专和门徒讲论神的国（徒一3）。到了五旬节，门徒就在耶路撒冷，并到各地传扬福音（徒二1-41，八1-4）。使徒行传告诉我们，他们到各地所传的福音，都是关系神的国（徒八12，十四22）。甚至保罗自己也说，他所传神恩典的福音，就是神的国；神的国就是神福音的内容（徒二十24-25）。
到了书信，在罗马书，使徒保罗说，‘神的国不在于吃喝，乃在于公义、和平、并圣灵中的喜乐’（罗十四17）。歌罗西一章十三节告诉我们，神的救恩拯救我们，是要把我们从原来黑暗的权势中，救到祂爱子的国里。从神的眼光看，我们原是在撒但的国里，那是黑暗的权势；如今神把我们从那黑暗权势的国里救出来，迁到祂爱子的国度里。
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The Gospel of the New Testament Is Concerning the Kingdom of God – Matt. 24:14
In the New Testament era, which is also the gospel era, the first words God said to men were: “Repent, for the kingdom of the heavens has come near” (Matt. 3:2). This was spoken through John the Baptist. When the Lord Jesus came out to preach, the first words he spoke were still: “Repent, for the kingdom of the heavens has come near” (Matt. 4:17). Why do we need to repent? Because the kingdom of the heavens is coming; repentance enables men to enter into the kingdom of the heavens. Repentance not only allows men to have their sins forgiven, receive life, be reborn and saved; repentance also brings men into a kingdom. Later we saw that the Lord Jesus went about all the cities and the villages, teaching in their synagogues, he preached not only the gospel of forgiveness of sins and the gospel of life, but also the gospel of the kingdom (Matt. 9:35).
We see in the Acts of the Apostles that after his resurrection, the Lord Jesus spent forty days speaking exclusively concerning the kingdom of God to his disciples (Acts 1:3). On the day of Pentecost, the disciples were in Jerusalem and traveling to various places to preach the gospel (Acts 2:1-41; 8:1-4). The Book of Acts tells us that the gospel they preached was related to the kingdom of God (Acts 8:12, 14:22). Even Paul himself said that the gospel of the grace of God that he preached was the kingdom of God; the kingdom of God is the content of the gospel of God (Acts 20:24-25).
When we come to the epistles, the book of Romans, the apostle Paul said, “For the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit” (Rom. 14:17). Colossians 1:13 tells us that God’s salvation delivers us out of the authority of darkness and transfers us into the kingdom of the Son of his love. From God’s perspective, we were originally in the kingdom of Satan, which was the power of darkness; now God has rescued us out of the kingdom of darkness and transferred us into the kingdom of his beloved Son.