From the Orthodox Study Bible
Galatians 1:11The true gospel is taught by true apostles, but many declare themselves to be apostles. How can we know true apostles from false? (1) True apostles are called by God. They learn the gospel by revelation, either directly from the risen Son, as did the original apostles (1:11, 12), or by the revelation of apostolic tradition (2Ti 2:2). They are called by grace, not according to works or a “proper” background (1:13–17). A true apostle brings glory to God, not to himself (1:18–23). (2) True apostles form one church government, holding the same doctrine and working by agreement reached in council (2:6–10). (3) True apostles stand firm in matters of conscience and are correctable when mistaken (2:11–14). Thus, Paul rebukes Peter sharply in public for his hypocritical ethnic elitism. [1:11, 12] Apostolic tradition is grounded in divine revelation from Jesus Christ. Just as the Twelve were called by Christ, so was Paul (v. 1). Just as the Twelve received the gospel directly from Christ, so did Paul (Acts 9:3–6; 26:13–18). Just as the Twelve stood together as one, so Paul entered their unity in consensus and mutual submission.
Galatians 1:13-17People are called by God not according to former conduct (v. 13)—good or bad—but by God’s grace (v. 15). Paul, whom God called in mercy, received grace from Ananias’ hands and the waters of baptism (Acts 9:10–19). Separated me from my mother’s womb (v. 15) refers not to Paul’s physical birth but to God’s calling Paul to apostolic ministry before he was born (see Ps 138:15, 16; Is 49:1; Jer 1:5; Lk 1:35, 43, 44, 48). As with Paul, God’s intentions for a person may lie hidden for years.
Galatians 1:18-20As a true apostle, Paul submits himself to the Church and her apostles rather than elevating himself. Paul knows his encounter with Christ, instruction in the gospel, and call to apostleship are highly unusual—in a private revelation, the only other witness is God (v. 20). But he also knows he must teach the same gospel as the other apostles.
Galatians 1:19James is James the Just, the first bishop of Jerusalem and author of the Epistle of James. Brother also means cousin or close relation (see the Introduction to the Epistle of James).
Matthew 13:55Brothers: See note at 12:46–50.