The tongue is the most evil part of the body because it is not connected to a person's spirit. If the tongue were connected to the spirit, it would be impossible for humanity to become redeemed because no sooner were they cleansed than they would again become defiled. It is impossible for the brain to control the tongue because the tongue is not connected to the full brain, but only to the brainstem. The parts of the body that are connected to the brainstem operate without thought, or mind. Unlike the other parts of the body that operate reflexively, the tongue can be controlled either by Satan, or by the Holy Spirit Of God.
In order for the tongue to be controlled by God, one must place its rudder into the hands of the Holy Spirit Of God, and pray continuously that your speech will be conscious, deliberate, and spoken with gentleness and respect. If we don't respect each other, we cannot possibly claim to respect God. This does not mean that we cannot challenge evil, however, in ordinary matters of opinion, we should focus on speaking gently and respectfully. If your tongue is not tamed by the indwelling Holy Spirit Of God, you will be deemed unfit to enter into eternity, and will be incapable of enduring for a thousand years.
The Lord God Almighty El Shaddai