The bible says that faith comes by hearing and hearing of the word of God (Romans 10:17). So first comes the word, then comes faith. However if the word is not mixed with faith, is not profitable Hebrews 4:2, 1 Thessalonians 13. Furthermore, if faith is not mixed with works, it is not profitable Luke 6:49, James 2:14-26.
Understanding this principles will help you understand how healing, salvation, and walking in victory works.
Healethee's Blog 
Simple to the point truth.