The theme of Philippians is this: Joy in Gospel Partnership and Advancement. That is joy that is centered in Jesus Christ and that we share in serving Him and His kingdom together as His people. The Holy Spirit will use this letter to parse out our true and lasting joy in Christ from our false and fading attempts at joy that we come up with ourselves and attach to a host of things besides God. God desires His Church to be a people of great joy, formed in the great news of Christ crucified and resurrected. And as we are shaped by the good news that brings great joy, we would share in that joy together in gospel partnership with the aim of seeing more and more people enter into the joy of Christ and replicating that joy toward others.