Acts 7 records a Gospel sermon proclaimed to Paul before he was born again.  Paul, approving of Stephen’s execution, would have been aware of this testimony. Sometime later, Paul is brought to repentance and faith by the sovereign grace of God & now we read his own Gospel sermon preached to the church in Corinth in I Corinthians 15.
     I Cor 15:1-3 provides an outline for the remainder of the chapter.  Each section following this introduction contains increasingly detailed content. The Gospel that Paul preached and upon which the Church stands is summarized in verses 3-11. Verses 12-34 expound the resurrection as a theological nonnegotiable… the resurrection is essential doctrine to Christianity. To deny it is to deny the faith, rendering everything else you happen to profess meaningless, futile, vain, & useless. Finally, verses 35–58 address frequently asked questions about eternal life answering them with a profound and glorious explanation according to the scriptures proclaimed, fulfilled, and applied.