"Paul, and Silvanus, and Timotheus, unto the church of the
Thessalonians which is in God the Father and in the Lord Jesus Christ: Grace be
unto you, and peace, from God our Father, and the Lord Jesus
"... in Him we live, and move, and have our being, as certain also of your own poets have said, For we are also His offspring" (Acts 17:28).But this obviously is not the sense in which Paul uses the phrase in his greetings to the ecclesias. The relationship which believers have with God the Father is not biological; it is mental and moral, a matter of enlightened choice and intelligent obedience. This "Fatherhood" is restricted to those who are born anew, in faith (Gal 3:26; John 3:1; 5:4) through baptism (Rom 6:3; 8:10), which constitutes "adoption" ("huiothesis": placing in the position of a son; sonship) (Rom 8:16,17; Gal 4:5).
"Peace I leave with you: my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid... These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world (John 14:27; 16:33).And Paul, beaten sorely and chained in the Philippian prison for the sake of the glorious gospel he preached, sang hymns of praise at midnight (Acts 16:25). Later he assures the brethren in Philippi, who had been so moved by his earlier witness, that the "peace" he had experienced and revealed to others could be their "peace" as well:
"the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus" (Phi 4:7)."From God our Father, and the Lord Jesus Christ": A number of manuscripts omit this repetition, with the suggestion that it is possibly borrowed from earlier in the verse. Thus it does not appear in the NIV and RSV.