Ephesians 1:1–2 (ESV)
1Paul, an apostle of Christ Jesus by the will of God, To the saints who are [in Ephesus,] and are faithful in Christ Jesus:
Paul: see Author. Paul is named as the author and so he is.
An apostle…by the will of God: Paul is writing in an official capacity so he uses the official title “apostle.” This epistle, then, carries apostolic weight. He is a representative, an ambassador of Christ, sent as His emissary in harmony with the will of God. This was not something that was conferred onto Paul by any man or which he took for himself; Paul was an apostle according to the desire, intent, and purpose of God.
To the saints…[in Ephesus]: or “to those who are saints and faithful in Christ Jesus.” The Ephesians are both saints and faithful. They have been set apart unto God and put their faith into action. This is true of all Christians—they are saints and they are faithful. For more on “in Ephesus” see Introductory Material.
And are faithful in Christ Jesus: This phrase indicates that Paul intended a larger audience than just those Christians in Ephesus. The phrase “in Christ Jesus” appears 176 times in Paul’s writings, 36 of which are in Ephesians. This is obviously the keystone to Paul’s theology.
2Grace to you and peace from God our Father and the Lord Jesus Christ.
Grace to you and peace: This is the Christian rendering of the greeting with which letters in antiquity generally began. It combines the Greek greeting (grace, Gk charis) with the Hebrew greeting (peace, or shalom). Grace is God’s unmerited favor. We don’t earn it or deserve it. Paul invokes God’s grace upon this community (pl. “you”). not merely the absence of war but the subtle understanding that God is in control of everything. Grace brings peace. Taken together they are Paul’s customary form of greeting (see Rom 1.7; 1 Cor 1.3; 2 Cor 1.2).
From God our Father and the Lord Jesus Christ: God the Father & Son are the source of both grace and peace. So Paul equates (but does not conflate) the Father and Christ. The distinction is not one of nature but of relation to the recipients of the grace and peace: God is Father, having made them children by adoption; Christ is Lord as Head of the Church. Grace comes from the God who is rich in grace (cf. 1.7). Peace must come from the “God of peace” (4.9).