Mantras are only endowed with transformative energy if given in initiation (dīkṣa) from the mouth of a guru. It's not necessarily a lot of right pronunciation, but somewhat the facility with which the mantra is endowed that offers it transforming capacity. Both Vedic and Avestan mantras have numerous practical similarities. https://lukasefubh.livebloggs.com/43545894/5-tips-about-world-famous-tantrik-gouldie-madan-you-can-use-today