New Defender's Study Bible Notes
2:13 word of God. Note that Paul here, as he does often in his writings (e.g., Galatians 1:11-12) claims to be preaching the inspired word of God.
2:13 effectually worketh. “Effectually worketh” (Greek energeo) could well be transliterated as “energized.” The Word of God indeed is “powerful” (same word—Hebrews 4:12).