Walter Lane spoke at Netherwood this Sunday about priorities, and the message of Christ's death and resurrection being the of first priority in the gospel. I don't know, I may have lost some readers just by using the word "gospel." It's not as commonplace of a word as it used to be. It means good news, the revelation of Christ to the world. It is synonymous with truth. To take something as "gospel" means to assume it is true.
In any case, it is based on this message from Paul (1 Corinthians 15:1-8):