Paul, an apostle of Jesus Christ by the will of God, and Timothy our brother, unto the church of God which is at Corinth, with all the saints who are in all Achaia:
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In his first epistle, Paul said that he would send Timothy with the letter, but now he associates Timothy with him. Why is this? Evidently Timothy had already accomplished his mission and returned to be with Paul. Having been for some time in Asia, they had crossed into Macedonia, from which he wrote this letter. By associating Timothy with himself, Paul increased respect for him and displayed his own great humility, since Timothy was far less well known than Paul. But love brings all things together.