Focus for a moment on 3 – 6. Note the way Paul leverages the criticism that is aimed at him into a strong argument. He is essentially being accused of ministering out of the flesh. He acknowledges that he is still walking, read living,, in his fleshly body, but he is not warring in the arena.
Daily we are to be engaged in this battle. Not only to fight to walk with our Lord in integrity but also to share that light with those around us. They are blinded. They are being deceived by the world which is under the dominion, now, of the enemy of the Lord. The only way that we can walk with Him and serve them is through daily warring with divine weapons. Those divine weapons Paul outlines in Ephesians 6:10 – 20.