(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;) The weapons of our warfare - The apostle often uses the metaphor of a warfare to represent the life and trials of a Christian minister. See Ephesians 6:10-17; 1 Timothy 1:18; 2 Timothy 2:3-5.
Are not carnal - Here he refers to the means used by the false apostle in order to secure his party; he calumniated St. Paul, traduced the truth, preached false and licentious doctrines, and supported these with sophistical reasonings.
But mighty through God - Our doctrines are true and pure, they come from God and lead to him, and he accompanies them with his mighty power to the hearts of those who hear them; and the strong holds - the apparently solid and cogent reasoning of the philosophers, we, by these doctrines, pull down; and thus the fortifications of heathenism are destroyed, and the cause of Christ triumphs wherever we come; and we put to flight the armies of the aliens.