A SUBSTITUTE: The "good news" of the gospel is that there is a substitute who has stood in the place of every repentant sinner and bore the wrath of God in his place. He did this for all whom the Father had given Him from all eternity. It is for them that He prays in John 17. They are "His Sheep," the Father gave them to Him, and He died for them (Jn. 10:15, 29). Substitution is at the very heart of the gospel. Christ did not simply give His life to make salvation possible for those who contribute their part to what He has done by repenting and trusting Christ. He it is that gives repentance and faith (2 Tim. 2:25; Eph. 2:8). Christ did not say to the religious Jews of His day that they were not of His "sheep" because they did not believe; rather, He says, "You do not believe because you are not of my sheep." If they had been His sheep they would have believed. The "good news" is that all whom the Father has given to the Son, and for whom He died will believe and manifest true repentance and faith. This they will do willingly and with gratitude in their hearts. It is God's work. He cannot fail.
THE ONLY TRUE GOSPEL: All this is very different from what we are being told today. Today's "gospels" are centered on man and what he has to do to make the work of Christ effective for him. The good news is that God has done all that is required to satisfy His righteousness and justice and that all who come to Christ will have eternal life through the work of Christ, their substitute, alone. This is the gospel, the only gospel, and we cannot and must not unite with those who do not proclaim it. Anything else is not the gospel.