Philippians 1:1 - Coke's Commentary on the Holy Bible

Paul and Timotheus,— This and the following verse contain the inscription, or introduction of this Epistle. St. Paul might choose to join Timothy with him, as he not only had attended the Apostle in his general travels into these parts, but had assisted in preaching the gospel at Philippi. Comp. Acts 16:1; Acts 16:3; Acts 16:12. Some have inquired why St. Paul does not stile himself an Apostle here, and in his two Epistles to the Thessalonians, and in that to Philemon, as he does in all the other Epistles which bear his name; and have accounted for it by observing, that no objection had been made to his character at Thessalonica or Philippi; and that, having received a present from them, he might not seem to be burdensome as an apostle of Christ. Perhaps it rather was, because Timothy and Silas, who were neither of them apostles, are joined with him here, and in the Epistles to the Thessalonians.