2 Corinthians 10:3-8

For though we walk in the flesh [as mortal men], we are not carrying on our [spiritual] warfare according to the flesh and using the weapons of man. The weapons of our warfare are not physical [weapons of flesh and blood]. Our weapons are divinely powerful for the destruction of fortresses. We are destroying sophisticated arguments and every exalted and proud thing that sets itself up against the [true] knowledge of God, and we are taking every thought and purpose captive to the obedience of Christ, being ready to punish every act of disobedience, when your own obedience [as a church] is complete. You are looking [only] at the outward appearance of things. If anyone is confident that he is Christ’s, he should reflect and consider this, that just as he is Christ’s, so too are we. For even though I boast rather freely about the authority the Lord gave us for building you up and not for destroying you, I will not be ashamed [of the truth]