मन्त्रहीनं क्रियाहीनं भक्तिहीनं कपीश्वर नासै रोग हरै सब पीरा। जपत निरंतर हनुमत बीरा॥ You may or may not believe in supernatural forces, however it is a perception that ghosts, devils or any kind of evil spirits never ever trouble a one who on a regular basis recites the Hanuman Mantra. https://one-directory.com/listings756442/the-definitive-guide-to-hanuman-mantra