Paul, Silvanus, and Timothy, to the assembly of the Thessalonians in God the Father and the Lord Jesus Christ: Grace to you and peace from God our Father and the Lord Jesus Christ.
Grace is God’s favour toward man, free and unmerited; peace is the result to all who receive that favour in Christ. Thus these two words sum up the gospel, its cause and its effect, cp. Romans 3:24 with 5:1" (Hogg and Vine 29).