Paul writes to the Philippians encouraging them to rejoice in their faith and warning against overconfidence in their heritage or status. He explains that he once took pride in his Jewish heritage and status as a Pharisee, but now considers all of that as rubbish compared to knowing Christ. He urges the Philippians to pursue knowing Christ by imitating his example of suffering, forgetting the past, and striving toward the goal of life in heaven, where their bodies will be transformed to be like Christ's glorious body.