Paul instructed us to set our affections on things above. Other Bible translations say mind, but the mind is too broad a term. I believe affection captures the deeper meaning of what Paul is saying:
If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God.
Colossians 3:1–3 KJV
The King James Version translates the Greek word logismos as imagination. The New King James Version uses the word arguments. I would point out that many arguments are derived from imaginations, not from objective truth. Paul makes the case that here is where one is engaged in warfare: “For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts its self against the knowledge of God.” (2 Corinthians 10:4–5b KJV).
It is in the realm of our imaginations, speculations, and arguments that the enemy of our soul works. He causes us to doubt God and trust our own natural thoughts. The more you study the realm of reasoning and imagination of the mind, the more you will become aware of the direct relationship these two areas have on each other.
We do not fight this battle with natural weapons of war. We overcome through the Word of God, through prayer, and through the authority given to us by the Holy Spirit. Every thought is to be brought into obedience to Christ. Beloved, He is the final word!