Because of the resurrection of Jesus we have a mission. The apostle Paul cut to the core issue of being a follower of Jesus with his statement:
But if there is no resurrection of the dead, then not even Christ has been raised. And if Christ has not been raised, then our preaching is in vain and your faith is in vain. … But Christ has indeed been raised from the dead. 1 Corinthians 15:13-14; 20
And that reality gives us a cause to serve, a mission to live.