Letters typically begin with a greeting.
In New Testament times, Greek-speaking writers began their letters with the word chairein, “Greetings!” (e.g., Acts 15:23, 23:26; James 1:1). Paul, who wrote his letters in Greek, transformed this epistolary convention by replacing chairein with the similar looking and sounding charis in the greeting of all his letters, and by adding eirēnē. So, this is the standard greeting in Paul’s letters: “Grace and peace to you from God our Father and from the Lord Jesus Christ.”
Paul’s standard greeting is a wonderful way for Christians to begin their letters (or emails) to other people.
For one thing, it perpetrates a little theology by defining who God is. He is “our Father,” that is, the Creator of the cosmos (Acts 17:28), the First Person of the Trinity (John 5:18), and the Adoptive Parent of all who believe in him (Eph. 1:5). Paul further describes God using the phrase, “Lord Jesus Christ.” The word Lord names Jesus’s divinity. He is the Second Person of the Trinity (Phil. 2:9-11, cf. Isa. 45:23). The word Christ names Jesus’s purpose. He is “the Messiah, the Lord”—the one whose coming into the world brings “good news of great joy to all people” (Luke 2:10,11). And finally, this Divine Person, this Promised Messiah is simple Jesus of Nazareth, who “died for our sins according to the Scriptures, …was buried, …was raised on the third day according to the Scriptures, and … appeared to [Peter], and then to the Twelve” (1 Cor. 15:3–5).
For another thing, Paul’s standard greeting perpetrates a little soteriology—i.e., the doctrine of salvation—by identifying the source (grace) and result (peace) of God’s saving work in our lives. Charis means “favor,” and grace is God’s unmerited favor, his decision to love, redeem, forgive, and bless sinners who don’t deserve any of those things. “It is by grace you have been saved,” Paul writes in Ephesians 2:8. Peace has three dimensions: We have peace with God (Rom. 5:1), with one another (Eph. 2:14–18), and within ourselves (Rom. 8:6).
The doctrine of God and the doctrine of salvation in the simple greeting of a letter!
But here’s the kicker: In 1 Thessalonians 1:1—and there alone in the greeting of all his letters—Paul simply wrote, “Grace and peace to you.” He left out “from God the Father and from our Lord Jesus Christ.” Paul assumed the Thessalonians knew the ultimate source and result of God’s saving work. He had founded their church, after all (Acts 17:1–9).
So why did he leave out the rich bits of theology and soteriology? Because it is one thing to wish God would give people his grace and peace, and another thing to give them your own grace and peace. Paul wants us to be Christians who don’t talk about God one way and then act toward people another way. He wants us to imitate God’s way of doing things in everything we do.
So, grace and peace to you…from me. Please pass them along to others!
 See Rom. 1:7, 1 Cor. 1:3, 2 Cor. 1:2, Gal. 1:3, Eph. 1:2, Phil. 1:2, Col. 1:2, 1 Thes. 1:1, 2 Thes. 1:2; 1 Tim. 1:2, 2 Tim. 1:2, Titus 1:4, Phm. 1:3 for Paul’s standard greeting and its minor variations.