That sickness shakes and he begins to turn loose

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Why?

If there's sin in your life, get it out. If there's condemnation, get it out. If there's doubt, get it out. Until you can see perfectly that it's God's will, it's God's plan, and you're included in that, then say, “Sickness, in the Name of Jesus Christ, get away from me.” And remember, you might not feel any better for a week. But as soon as you said that word, something happened. God has to keep His Word. That sickness shakes, and he begins to turn loose. He will go if you'll just believe it. Don't doubt.
Like Peter walking on the water, He said, “Why did you doubt? Oh, ye of little faith.” Just because he was sinking, that had nothing to do with it. Christ had commanded him, and His Word was enough. That's the way we should think it too.

Daily Bread Hebrews 10:23
Let us hold fast the profession of our faith without wavering...