" What Paul meant by the Gospel was no list of uninterpreted events; the Gospel is the theology of those events, plus other matters of theology not so closely tied to any events (such as the doctrine of the Trinity and the form of church government)....Christ's death was, of course an occurrence that Paul had known almost as soon as it took place. 'For our sins' is the theological interpretation of which Christ had convinced him. However, even this is not the Gospel: Paul must add 'according to the Scriptures.' So far is Paul from restricting the Gospel to some narrow 'kerugma,' or six points of a truncated statement of faith, that he appeals to the Scripture as a whole...."

Clark's commentary First Corinthians page 252