Christianity hinges on the Gospel, the good news of Jesus Christ! After many chapters detailing the Corinthians sinful past, Paul makes the turn in 1 Corinthians 15 to describe their glorious future that is only possible through the Gospel itself.
It’s all been building to this! Luke wants us to see, the whole book, the whole Bible points to this. Jesus said, “It is written: The Messiah will suffer and rise from the dead on the third day, and repentance for the forgiveness of sins will be preached in His name to all the nations.” (Luke 24:46-47)