Faith is the operating, guiding light of a believer in Jesus Christ.
"Whatsoever is not of faith is sin." (Romans 14:23)
We walk by faith, not by sight. (2 Cornithians 5:7)
Jesus even comforts us not be of doubtful mind (Luke 12:29)
So, how do we effect living by faith?
We believe, we affirm his blessed promises in us, which are in His word!
Every believer is called to live by the faith of the Son of God (cf Galatians 2:20)
When faced with any new situation, the Holy Spirit leads, and His peace operates as judge, an umpire helping us determine the proper course of action:
"And let the peace of God rule in your hearts, to the which also ye are called in one body; and be ye thankful." (Colossians 3:15)
Here, Paul uses for "rule" the word βραβεύω, brabeúō, which means to rule, arbitrate, or "act as an umpire".
This peace of God enables a believer to know with utmost simplicity if he or she is living in the will of God.
Anything that jars this peace, anything that causes doubts to arise in the heart of a believer, is to be discharged or dismissed immediately.
Indeed, may the peace of God rule in the heart of every believer.