If you have not read parts 1 and 2 yet, here are links for those:

https://www.dailystrength.org/group/christian-overcomers/discussion/how-do-we-overcome-unbelief-part-1

https://www.dailystrength.org/group/christian-overcomers/discussion/how-to-overcome-unbelief-part-2

FASTING AND PRAYER

This is important.  You have five senses—what you can see, taste, hear, smell, and feel.  If one of those senses were to be damaged, let’s say you went blind, you could still get around.  What you’d have to do is depend more upon your other remaining senses, like hearing and feeling.  You would have to listen to what’s happening around you, and use a cane to touch and feel the variances in the ground ahead as you walk along.  You could still get around and walk places, but you’d have to rely more on your other senses.

Some blind people memorize what their apartment is like, and where everything is.  They can walk in the dark because they aren’t using their eyes.  They’re using their ears and touch primarily.  So you can compensate for losing one of your senses by depending on the others more.

What happens when God reveals through His Word the it is His will to heal you, but all five senses are telling you, “It didn’t work.  I feel pain.  I still look sick.  I still have this and that, and I can taste something in my mouth that shows me I haven’t been healed yet?”  If all five of your senses are telling you it didn’t work, you need to develop a sixth sense that will tell you it did work.  That sixth sense is faith. 

You can get to where you actually believe that you have faith, and that faith becomes as real to you as what you see, taste, hear, smell, and feel.  You do that by spending time in the spiritual realm.  That’s what prayer and fasting are all about. 

Fasting doesn’t change God.  It doesn’t make Him move.  Fasting and prayer don’t make demons leave.  There is no demon that you will ever encounter that will require fasting and prayer added to what Jesus has already done to cast them out.  If you encounter a demon and it doesn’t respond to the name of Jesus and faith in His name, then your prayer and fasting isn’t going to get them out either.  Speaking the Word of God and the name of Jesus in faith will deal with any demon.  So, your fasting and prayer doesn’t move God.  Neither does it move the devil.  Fasting and prayer moves you.  If affects you. 

Your appetite is one of the strongest desires your flesh has.  When you deny your flesh by fasting, it’s going to rise up and rebel because it wants to be fed.  Your flesh wants to be indulged and taken care of.  If you tell your flesh, “No!  Man doesn’t eat by bread alone, but by every word that proceeds from the mouth of God” (Matthew 4:4; Luke 4:4), I can guarantee you that your flesh is going to rebel.  Although you’ll think that you are dying by noon the first day, it’s not true.  If you persevere, after a while your body and your senses will begin will begin to learn.  They’ll say, “Hey, I didn’t die by noon.”  As a matter of fact, after fasting about three days, you’ll get where you aren’t even hungry anymore. 

You may not have experienced this yet, but it’s true.  You can literally bring your five senses under control, and they’ll begin to recognize that, “Hey, I’m not going to starve.  Okay, this faith stuff is real.”  You really can be sustained by God, and not by food alone.  You can teach your flesh that. 

Then when you say to your body, “You’re healed in Jesus name,” your flesh may answer, “I still hurt,” but that sixth sense says, “I’m healed and I believe it.   So okay, I’ve experienced this before.”  But if you haven’t spent time fasting, praying, and being in the presence of God, your body will say, “No, I still hurt.”  You’ll say, “Body get in line,” but your flesh will answer, “Who are you to tell me what to do?  I tell you when to eat, what to eat, and how much to eat.”  It’s just like a spoiled brat.  But you can train your senses to discern bout good (God and His Word) and evil (what contradicts them). 

Strong meat bringeth to them that are full of age, even those who by reason of use have their senses exercised to discern both good and evil.

Hebrews 5:14

You can get to a place where someone like Smith Wigglesworth lived, listening to what faith has to say more than what the natural things like your mind, emotions, senses, and circumstances have to say.  When you do that, you’re decreasing in unbelief.

(Taken from Andrew Wommack's book "God Wants You Well")