The peace of God and the faith of God belong together. Peace keeps us constant while the winds and waves of doubts try to assail from without. Peace helps us walk on water though everything looks contrary to it.
The Spirit witnesses with the spirit and reveals the things of God. He is the Spirit of wisdom and the fear of the Lord. The Spirit raises a banner of peace when floods come against us.
The peace of God is the agreement of the Spirit with our spirit. The flesh disagrees and tries to be violent and aggressive. The carnal mind involves in carnal, godless rationalizations. The spiritual mind agrees with and submits to the Law of God.
Discernment is important in all this. The Spirit gives us discernment.
The Spirit forbids and our spirits are not peaceful. The Spirit is the spirit of fearlessness, of courage, of love, of power, and of a sound mind.
Peacelessness creates an insane-like situation. The peace of God guards our hearts and minds through Christ Jesus.