Proverbs 2:11 Discretion will protect you, and understanding will guard you( NIV).
TAKE CAUTION
I heard the story of a preacher who prayed for a cripple comes to mind. Miraculously, the cripple walked and everyone saw the manifestation of God's power.
However, this preacher didn't take caution, he wanted everyone to see how genuine the miracle was. Instead of telling the man to walk, he told him to dance. Not long after, the recipient of the healing died.
He understood later that he shouldn't have instructed him to dance but to walk. He may have given that instruction thinking dancing was an action of faith but it was the right action at the wrong time. In cases like that, physiotherapists can tell what the next line of action should be.
That is why some healing ministers have medics in their team for counseling purposes. That we operate in the supernatural is not an excuse to throw caution to the wind. In life, we need to apply godly wisdom in all we do.
Another reason some believers lose their healing is because of failure to take wise precautions after receiving their healing and miracle. For instance, If God heals Mr John of diabetes and hypertension with clinical proofs, it is not an excuse to eat any how and live carelessly thereafter.
Some may say, "but if it is God that healed him, why shouldn't he eat whatever he likes"? Well, we should not forget that we still live in a mortal body that is prone to decay. "Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day." (2Cor 4:16).
Do not neglect your body after receiving healing. The habits that brought sickness upon you should be discontinued. If you do not obey simple medical advice, it shows you don't love yourself.
Doctors are not enemies of divine healing neither are they anti Christ. In fact, medical wisdom is from God. There are believers who avoid doctors like plague because of what they heard from a preacher.
You maybe surprised that the same preacher checks his health regularly and follow a strict diet regime. The dietician is not an enemy of your nutrition rather he is there to help you put things in the right perspective so that you won't eat poison in the name of food. Be wise!
Father, I receive wisdom concerning these things in Jesus name.