Philippians 1:6Prison letter context (trad.)
being confident of this very thing, that he who began a good work in you will complete it until the day of Jesus Christ.
Paul urges a completion that is embodied in work and rest. Philippians 1:6: trace "being" and "confident". Align completion in promises we keep—anchor courage in promise.
Philippians speaks here as epistle/letter writing, naming completion. Placed in ch. 1, the nearby lines set its tone. The nearby sentences supply the texture.