6:20

I am acting as an ambassador in chains: Paul wrote this letter to the Ephesians when he was imprisoned in Rome, which explains why he called himself “an ambassador in chains.” (Eph 3:1; 4:1) In Biblical usage, an ambassador is an official representative dispatched by a ruler on a special occasion for a specific purpose. As one of God’s spirit-anointed ambassadors, Paul bore a message to the people of his day about being reconciled to God through Christ.​—See the study notes on 2Co 5:20.

I may speak . . . with boldness: Or “I may speak . . . with freeness of speech.” Paul was a prisoner in Rome, and here he asks his fellow believers to pray for him so that he “may speak . . . with boldness [a form of the Greek verb par·re·si·aʹzo·mai].” (Eph 6:19) The account in Acts reveals that while imprisoned, Paul continued preaching the Kingdom of God “with the greatest freeness of speech [a form of the related Greek noun par·re·siʹa], without hindrance,” indicating that the prayers made in his behalf had been answered. (Ac 28:30, 31) Boldness was an identifying mark of the preaching done by the early Christians.​—Ac 4:13, 29; see study note on Ac 28:31.