1 Corinthians 15 is focused on the centrality of the resurrection. But as Paul begins, he focuses on his own experience of the resurrection. As I was studying this passage earlier this year I wanted to try and understand what Paul was getting at in 1 Cor 15:8-11. As he finishes describing appearances of Christ after His resurrection he concludes,
…and last of all, as to one untimely born, He appeared to me also. For I am the least of the apostles, and not fit to be called an apostle, because I persecuted the church of God. But by the grace of God I am what I am, and His grace toward me did not prove vain; but I labored even more than all of them, yet not I, but the grace of God with me. Whether then it was I or they, so we preach and so you believed.
Paul saw his live as powered by the grace which God had extended to him. This has practical ramifications for us today.