1Paul, 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.
2We always give thanks to God for all of you, mentioning you in our prayers, 3remembering without ceasing your work of faith and labor of love and perseverance of hope in our Lord Jesus Christ, before our God and Father. 4We know, brothers loved by God, that you are chosen, 5and that our Good News came to you not in word only, but also in power, and in the Holy Spirit and with much assurance. You know what kind of men we showed ourselves to be among you for your sake. 6You became imitators of us and of the Lord, having received the word in much affliction, with joy of the Holy Spirit, 7so that you became an example to all who believe in Macedonia and in Achaia. 8For from you the word of the Lord has been declared, not only in Macedonia and Achaia, but also in every place your faith toward God has gone out, so that we need not to say anything. 9For they themselves report concerning us what kind of a reception we had from you, and how you turned to God from idols to serve a living and true God, 10and to wait for his Son from heaven, whom he raised from the dead: Jesus, who delivers us from the wrath to come.
Faith (Gk. πίστις, pistis). (2:8; Matt 8:10; 9:2, 21:21, Mark 2:5, 11:22, Luke 7:9, 18:42, Acts 11:24, 24:24; Rom 3:22, 25, 12:3; 1Cor 13:2, 2Cor 5:7, 13:5, Gal 1:23, 5:6, Eph 4:13, Phil 3:9, Col 2:5, 1Thess 1:3, 2Thess 3:2, 1 Tim 3:9, 6:12, 2 Tim 2:18, 4:7, Tit 2:2, Phlm 5, Heb 6:1, 11:6; James 2:14, 1Pet 5:9, 2 Pet 1:5, Jn 5:4, Jude 3, Rev 2:19, 14:12) Strong’s 4102
This word, very common in the NT (243 times), can mean, 1) that which evokes faith, “faithful,” 2) “trust, confidence, faith,” 3) “body of faith, teaching.” It is a noun of action—related to the cognate verb πιστεύω (pisteuo) to “believe. It is hard to overstate the importance of this word to Christian theology, since relationship between humans and God is always dependent on faith. This verse uses the word in the second sense of “trust, confidence, faith.” Here, the reference is to saving faith, which amounts to trust in the person of Jesus (God—John 1:12; Eph 1:15) and the message of the Gospel (Jesus’ death and resurrection—1 Cor 15:1-5). Saving faith depends on knowing certain information, but also necessarily goes beyond believing these things to be true, to placing personal confidence and trust in what and who is known. In this verse, grace is the cause of salvation; faith is the means.