It is preached that the authority through Christ over all sickness and disease is not just applicable to the apostles who were eyewitnesses of Christ and to whom Jesus spoke but to all Christians of all time. It is taught that all Christians have this power. But what is the power, and from where does it come?
Instead of just sitting by passively allowing a sickness to have its way in our body, we can ask God for healing.  The power is in the Father. Since we are not living in the age of miraculous confirmation, God provides recovery by the natural means for healing the body. Sometimes, the body reacts to natural healing remedies and drugs, and sometimes it does not.  Finding the correct reaction to healing has been God’s business for many years.
In addition, Scientists have been saying for years that the power of faith and healing through prayer is a reality.  It is not merely the power of words in this healing but the power of faith, i.e., the confidence that this is only a temporary setback and will soon end because God will intervene for healing.  Cells of our body are affected by our thoughts, but those thoughts need not be spoken.  The wise man says, “As a man thinketh, so is he (Prov. 23:7).  Having a confident spirit of hope and confidence creates the right environment for healing.
However, the idea that we have been given the power to speak and command sickness to leave our bodies is not shared.  The authority given to speak the world into existence or command unclean spirits to come out of people is the power of God and those ambassadors to whom he gave that power. Such power does not reside in us and was never promised to us. Therefore, the authority to speak an illness into oblivion is not taught in the Bible.  If any impact is made from speaking to an illness to be removed, it is the power of faith that removes the fear and creates that positive environment for healing. Once the tongue speaks, whether true or not, the body and mind accept it as a reality.  This is the power of the tongue to which the Scriptures refer. The little member controls the whole body (James 3:2).
Womack’s booklet reads, “We can command symptoms to leave our body.” He then cites an example of a woman who spoke to symptoms that existed in specific areas of her body. Further, as already noted in the past, Jesus did not die so we would not be sick anymore. As long as we are in this body, we will groan (2 Cor. 4).  Not just us, but the whole creation groans and travels until now (Rom. 8).  It will not be until the redemption of the body that this will change.  God indeed wants us well. It is also true that he wants us to overcome sin or repent when necessary.  Yet, they coexist even though God takes no pleasure in it.  We will continue to struggle with sin and sickness.  This is the whole point of setting our affections on things above (Col. 3) and longing for the world that awaits the redeemed.
There is sickness beyond our control, but it will not last because this earthly body of clay won’t last long. Because of sin, it will die if lived long enough. Even the healthiest cannot remain in this mortal life. But, that’s no cause for sadness and despair. This is exactly what Paul was forced to learn when the Lord, who refused to answer his request that it be removed, said, “My grace is sufficient for you.” For that reason, Paul would glory in his weakness and infirmity because his faith in Christ and the promises of the hereafter were stronger.  If this life is all there was, I can see why one would be tempted to find some evidence of healing. But, this body in this life is not our focus.  Our hope focuses on the resurrection or the new life of immortality.