Philippians 1:3–11 is Paul’s expression of thanks and gratitude for the believers of Philippi. Not only have they been generous in their support of Paul, they have been faithful even when he was imprisoned. Paul claims to thank God for these Christians in all of his prayers. At the same time, Paul has high hopes that the church of Philippi will continue to mature and strengthen their relationship with Christ.
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“Philippians 1:6” Bibleref.com
6 being confident of this very thing, that he who began a good work in you will complete it until the day of Jesus Christ.