The Bible presents the Gospel as ‘wholistic,’ that is, it takes into consideration the complete man. It does not only offer salvation for his soul but also promises the redemption of his body (Rom. 8:23b). It does not only guarantee his citizenship in heaven (Phil. 3:20) but also the redemption of all creation (Rom. 8:23a; Jn. 3:16).
It is called the Gospel of the Kingdom, Mat. 24:14.
It is called the Gospel of Grace, Acts 20:24.
It is called the Gospel of the Glory of Christ, 2 Cor. 4:4.
But the fullness of the Gospel is not preached without precise Biblical teaching about the coming future Kingdom, without salvation that is by grace through faith through the death, resurrection, and the glory of it’s returning King.
The Church should get rid of the prosperity and social false gospels if she wants the fullness of the Gospel preached. In Mat. 28:18-19, before the King was taken up, he sent his apostles into the world to teach and observe everything he has commanded them.
The Gospel in its fullness, therefore, is the unwavering promise of God to redeem his creation from decay and corruption brought by sin through the atoning sacrificial death, resurrection, and glorification of his only begotten Son who will reign as firstborn putting all his enemies under his feet.