That does not mean that our faith needs to be loud. Devils know the difference between people who are bold and aggressive because of their faith and those who are simply covering their fears with aggressive behavior. Christians often try to cover their immaturity and fear when casting out devils—yelling threats, calling on angels for help, waving their hands, and more. But our authority comes from real faith, which is found in rest. Peaceful rest is the climate that faith grows in. (See Hebrews 3: 11-4: 11.) It is the Prince of Peace who will soon crush satan underneath our feet! (See Romans 16: 20.) Hearts (spirits) that find rest in Him can prevail over whatever does not originate with the Prince of Peace.