2 Corinthians 10:2-5

yea, I beseech you, that I may not when present show courage with the confidence wherewith I count to be bold against some, who count of us as if we walked according to the flesh. 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 mighty before God to the casting down of strongholds); casting down imaginations, and every high thing that is exalted against the knowledge of God, and bringing every thought into captivity to the obedience of Christ