Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand, by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain. For I delivered to you as of first importance what I also received, that Christ died for our sins according to the Scriptures, and that He was buried, and that He was raised on the third day according to the Scriptures, and that He appeared to Cephas, then to the twelve. – I Corinthians 15:1-5
The Apostle Paul had once preached the Gospel of Jesus Christ to the Corinthians. Now he is reminding them of it.
Is it because the same Gospel that saves us also sanctifies us? Is it because the Christians at Corinth needed to preach the Gospel to themselves every day? No, that is not found in this, or any other passage of Scripture. That would be eisogesis, or better, ‘lack-o-gesis’ at its finest. It is the error of New Calvinism, and it leads to antinomian thinking, ignoring the imperatives of Scripture to be obeyed in exchange for the freedom of lawlessness so enjoyed by myriads of young people today.
The reason Paul is making known the Gospel to the Corinthians once again is found in the Scripture itself, and in fact, in the same chapter; specifically, verses 12 and 13.
Now if Christ is preached, that He has been raised from the dead, how do some among you say that there is no resurrection of the dead?
The Apostle Paul is reminding them of the Gospel teaching, not because it sanctifies them by ‘going deeper’ and by contemplating more deeply the finished work of Christ, oh no. He is addressing the fact that some in Corinth who had professed Christ and professed to believe the Gospel, are now rejecting or objecting to the doctrine of the resurrection. They are believing that God raises the soul, but not the body.
That is why Paul is once again reminding them of the Gospel. Not to stress the necessity of the Gospel for the purpose of sanctification, but for doctrinal correction.
If any preacher tells you that the Gospel sanctifies you apart from obedience, that man needs to be marked for division according to Scripture.