Why was Paul's gospel to the Gentiles different from Peter's gospel to the Jews?
Paul's gospel to Gentiles was different because it was the gospel of the grace of God, not the gospel of the kingdom that Peter and the eleven preached to the Jew. Same God, but now He would save lost humanity—Jew and Gentile—by grace.
Les teaches that Paul communicated the gospel he preached among the Gentiles with absolute clarity. The Holy Spirit inspired that stipulation because Paul's gospel among the Gentiles was totally different from what Peter and the eleven preached to the Jew. It was still the same God, but God was no longer dealing only with Israel under the law and the kingdom economy. Now He would go to the Gentile world as well as the Jew, not with the gospel of the kingdom but with the gospel of the grace of God. Les emphasizes that this grace is what few comprehend: a holy, righteous God took on human flesh, went to the Roman cross, was tortured, crucified, shed His blood, and was raised from the dead to save lost humanity. That is all grace.
And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles, but privately to them which were of reputation, lest by any means I should run, or had run, in vain.
More Questions
Why did Paul specify that the gospel he communicated was the one he preached among the Gentiles?
The Holy Spirit inspired the stipulation about which gospel Paul preached because Paul's gospel to the Gentiles was totally different from what Peter and the eleven preached to the Jews.
What made Paul's gospel unique compared to what Peter and the others preached?
Paul's gospel was unique because Peter and the other apostles had not preached Paul's gospel, and they certainly had not preached it to Gentiles.