RobH_en_tn/php/01/03.md

I give thanks for your fellowship in the gospel

Paul is expressing thanks to God that the Philippians are also preaching the gospel. AT: "I give thanks to God that you are proclaiming the gospel" (See: rc://en/ta/man/translate/figs-metonymy)

I am confident

"I am sure"

he who began

"God, who began"