Not only does God's Word tell you that you can be healed, but from God's perspective, He does not even see you sick. He sees you well. You may wonder how you can believe this when your five senses tell you differently. This is faith. Sight is one of the five sense.
Sight represents the senses.
You cannot live by faith and go by the senses at the same time. You must choose either faith or sight. Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised. God's Word overrules any facts. I like to use the word F.A.C.T. as an acronym for False Appearance Contradicting Truth.