John 14:27

Peace I leave with you; My (perfect) peace I give to you. Do not be afraid. (Let My perfect peace calm you in every circumstance and give you courage and strength for every challenge.)

The world will never give us peace, but God is our peace and sanctuary. We will gain peace when we focus on God and turn away from the tormenting thoughts. First, we have to conquer the fleshly thoughts that will bombard us with what ifs and they said, or this is going to happen. The word of God is to rule and praise Him for our victory.