10:4 weapons. Prayer, the proclamation of the powerful Word of God, and the authority to drive away demonic opposition (Acts 16:18; Eph. 6:10–18). Also, there was a kind of powerful apostolic authority not often discussed, but apparent in the fate of Ananias and Sapphira (Acts 15:1–11) and Elymas (Acts 13:8–12).
strongholds. Paul is talking about spiritual strongholds, that is, centers of demonic opposition to the gospel (1 Pet. 5:8, 9; 1 John 5:19). Paul knew his opponents at Corinth were servants of Satan (11:14, 15), but that did not frighten him, for the power of the Holy Spirit within him was far greater.