In Philippians 3:1-9, Paul sees Christ as worth immeasurably more than anything else in this world. It's an incredible challenge for us, and at the same time liberating.
Whatever happens, conduct yourselves in a manner worthy of the gospel of Christ – in good times and bad, together, “working out” our salvation without grumbling – so that we can shine for Jesus.
For to me to live is Christ and to die is gain.
A key theme for Paul in his letter to the church in Philippi is koinonia, which we translate as sharing, participation, communion. Through the good news of Jesus we share in Christ, in the Holy Spirit and so also each other in the church.