“Whereof I am made a minister, according to the dispensation of God which is given to me for you, to fulfil the word of God” (Colossians 1:25).
A prevalent myth in Christendom is that there is only one Gospel in the Bible. No, there is only one Gospel today; there are many Gospels in Scripture. The common belief of “one-Gospel-in-Scripture” shows us just how ignorant “churchianity” really is concerning Scripture. They do not understand dispensational boundaries, so they smooth over (retranslate/question/deny) contradictory verses. They try to harmonize Paul with Jesus, James, and other Bible characters.
In the words of the Apostle Peter, “ And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;  As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest [twist, distort], as they do also the other scriptures, unto their own destruction” (2 Peter 3:15,16). Haters of dispensational Bible study existed 2000 years ago!
Just as “the Dispensation of the Grace of God” is committed to the Apostle Paul’s trust (Ephesians 3:2), “the Gospel of the Grace of God” is another one of God’s current “household rules.” Paul said in Acts 20:24: “But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God.” On three occasions, Paul called it “my gospel” (Romans 2:16; Romans 16:25; 2 Timothy 2:8). Why would he say “my gospel” if everyone in Scripture also preached it?! Furthermore, he said he went to Apostles James, Peter, and John in Jerusalem to “communicate unto them that gospel which I preach among the Gentiles” (Galatians 2:2). Surely, Paul and the 12 Apostles were preaching separate Gospels, for they were ministering to two separate groups. It is this, Paul’s Gospel, the Gospel of the Grace of God, whereby God forms the Church the Body of Christ… source