2 Corinthians 10:7-18

Paul had been accused by the false apostles of being a self-promoter, unimpressive in appearance and speech, and a bully in his letters, but a wimp when present.
But Paul knew who he was in Christ…
Paul would not respond with human wisdom, reasoning, or powers of persuasion…

"For though we walk in the flesh, we do not war according to the flesh, for the weapons of our warfare are not of the flesh, but divinely powerful for the destruction of fortresses. We are destroying speculations and every lofty thing raised up against the knowledge of God, and we are taking every thought captive to the obedience of Christ" (2 Corinthians 10:3-5 NASB).