The Bible says in Hebrews 5:13-14,”For every one that useth milk is unskilful in the word of righteousness: for he is a babe. But strong meat belongeth to them that are of full age [this is talking about maturity], even those who by reason of use have their senses exercised to discern both good and evil.”
These scriptures say that you can actually reprogram your mind, your senses and your emotions to discern good and evil, instead of constantly having them go in the other direction. When your feelings say “I hurt. Who cares what God’s Word says?” you can actually get them to acknowledge God’s Word. You can renew your mind so that it doesn’t always have to drag you toward the devil and away from God’s Word. You can even renew your senses so that they will begin to start bearing witness to God’s truth.
Of course, until you get a renewed body, you can never totally trust your senses so that they become the leading part of your personality. But you can get to the point they aren’t constantly screaming doubt and unbelief at you.
How do you do that? There are several ways, but the two primary ways are found in Matthew 17:19-21. Jesus had just cast a demon out of a boy, and the disciples asked Him, “Why could not we cast him out?” Jesus said, “Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.” Finally He says, “Howbeit this kind goeth not out but by prayer and fasting.”
Jesus is not saying that this kind of demon goes out only by prayer and fasting. There are no demons who need more than the name of Jesus to be cast out. You can fast and pray until you wither to nothing, and it will not increase your power against the devil one iota. Faith in the name of Jesus alone is what accomplishes the miracle. But fasting and prayer will cast out the kind of unbelief Jesus was talking about. It will eliminate what I call human, or natural, unbelief.