Proverbs 4:20-22 literally says that God's Word is medicine/health to our flesh.
What if someone invented a medication that could cure anything wrong with the human body. People would take that medicine faithfully to make sure it worked.
If we'd give God's promises on healing the same credibility that we give medicines, we would have 100 times the results.
God's words may be medicine to all our flesh, but just like medicine, we have to take it. We take God's medicine by hearing it and hearing it and hearing it. Romans 10:17 says, "So then faith comes by hearing and hearing by the Word of God.
When we take the time to continually hear God's Word, our faith hooks up and releases God's power for our healing!