Study the covenant God established with those who walk in obedience to Him. You can operate in faith according to your knowledge of His will or desire for your life. For example, if you do not know that God has already provided for your healing, how can you believe Him for a miracle in your health?
You must have a clear photograph of the will of God, so your faith can implement it.
“But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.”