Joy From a Prison Cell: Philippians 4
Philippians is Paul's most joy-saturated letter, and he wrote it in chains. Some form of "rejoice" appears sixteen times in four short chapters Philippians 4:4 English - ESV, dictated while he sat under Roman guard awaiting a trial that could end in execution.
The engine of that joy sits in chapter 4. Paul says he has learned to be content in every circumstance. Philippians 4:12 English - ESV The word he chooses is autarkes, a favorite term of the Stoic philosophers meaning self-sufficient. Paul borrows their word and then turns it inside out: his sufficiency is not in himself but in the One who strengthens him (Philippians 4:13 English - ESV).
Philippians 4:11 English - ESV
Notice that he learned it. Contentment was not Paul's temperament; it was a curriculum, taught through plenty and hunger, abundance and need. Joy that leans on circumstances is exactly what prison unlearned for him, and what he now hands to a church facing its own pressures: rejoice in the Lord always.
Philippians 1 Berean Standard Bible - Bob Souer
Roman soldier in battle gear. The confinement Paul was writing his most joyful letter from.