The gray matter between our ears is just the judgement center, our mind is our heart and every cell of our body, our very DNA. This is why David cried out for Him to search his heart for any wickedness. This is the meaning of renewing our minds, to rewrite our DNA, in Romans 12.The "mind of Christ" that we have does not dwell within our physical mind (brain), but in our new rebirth hearts. It never needs to be "renewed" or changed in any way. It is our physical mind that needs renewing by the Word of God so that our heart, and minds are in agreement or we will always be double minded, and never receive anything from the Lord. The unrenewed mind is the "enemy" of God because it can not operated by faith, and is not subject to the laws of God.
Hopefully we are all changing this enemy of God, so that our physical minds are always in agreement with our hearts where the mind of Christ dwells.