One day, you could be sitting in your house messing with your computer, eating supper, doing whatever it is that you do. Then one day, your house could burn down or be destroyed when you are not there, or could move to a different home. So you would have to find another house to live in.Now, just because your house is no longer there or you moved doesn't mean you are no longer alive does it?
Just as we live in a house, our spirit lives in our body. Just because our body dies, we are still alive because our body just houses our spirit.
For we know that if our earthly house of this tabernacle were dissolved, we have a building of God, an house not made with hands, eternal in the heavens. II Corinthians 5:1-11
Let us get right with God, in our spirit first, then our mind and body will follow suit to be healed.