1 Timothy 1:1

Here is, I. The inscription of the epistle, from whom it is sent: Paul an apostle of Jesus Christ, constituted an apostle by the commandment of God our Saviour, and Lord Jesus Christ. His credentials were unquestionable. He had not only a commission, but a commandment, not only from God our Saviour, but from Jesus Christ: he was a preacher of the gospel of Christ, and a minister of the kingdom of Christ. Observe, God is our Saviour. - Jesus Christ, who is our hope. Observe, Jesus Christ is a Christian's hope; our hope is in him, all our hope of eternal life is built upon him; Christ is in us the hope of glory, Col 1:27. He calls Timothy his own son, because he had been an instrument of his conversion, and because he had been a son that served him, served with him in the gospel, Phi 2:22. Timothy had not been wanting in the duty of a son to Paul, and Paul was not wanting in the care and tenderness of a father to him. II. The benediction is, grace, mercy, and peace, from God our Father. Some have observed that whereas in all the epistles to the churches the apostolical benediction is grace and peace, in these two epistles to Timothy and that to Titus it is grace, mercy, and peace: as if ministers had more need of God's mercy than other men.

— Matthew Henry's Concise Commentary (public domain)