How did Paul communicate the Gospel he preached among the Gentiles?

Les explains these are new revelations not found until Paul and not taught in the Old Testament. The Old Testament believer was not told the Spirit dwells within him, nor that he is justified by faith alone and bought with a price; all of this comes after the cross and resurrection were completed. Paul therefore communicated carefully, line upon line, precept upon precept, this Gospel—or that Gospel—he preached among the Gentiles. The Holy Spirit prompted the word “that” to signify the difference between Paul’s Gospel and what Peter, Jesus, and the eleven taught to Israel. Jesus and the twelve operated under the Gospel of the Kingdom: the King is here, ready to set up the Kingdom offered to Israel since Abraham, and Jesus of Nazareth is the Christ, Israel’s Messiah. The Gospel of Grace, however, is that this same crucified, buried, risen Messiah is Savior of the whole human race, not just Israel.