The word means good news or glad tidings. Popularly applied to the four NT records of the first coming of Christ, in Scripture it is used only of good news concerning major aspects of divine revelation.
The gospel of the kingdom is the good news that God is going to establish a kingdom. It was preached by John the Baptist, Matt. 3:1, 2; by Christ before He was rejected, Matt. 4:23, and by the disciples during the period when their ministry was restricted to Israel, Matt. 10:5-7. Its message, “Repent: for the kingdom of heaven is at hand,” Matt. 4:17, is not given during the present age, but it will again be proclaimed during the great tribulation, Matt. 24:14; Rev. 7:9, 14.
The gospel of salvation by grace through faith in Christ crucified and resurrected is mentioned under various descriptive terms some 85 times in the NT. It is described in 1 Cor. 15:1-5 as consisting of the death, burial and resurrection of Christ. A curse rests upon the preaching of “another gospel,” Gal. 1:6-9; 2 Cor. 11:4, such as the teaching that men are saved by keeping the law.
The everlasting gospel of Rev. 14:6, 7 is not defined as are the others, but its theme, “Fear God, and give glory to him,” is related to the final consummation of His purposes in the hour of final judgments.
William Evans, The Great Doctrines of the Bible, (Chicago: Bible Institute Colportage Assoc., 1912), WORDsearch CROSS e-book, Under: “Gospel”.
AMEN.