Mantra-Yantra-Tantra

When a Mantra( a set of particular words in a particular configuration and rhythm by chanting which one can fulfil one's wish) is chanted according to the proper Tantra( method to perform a worship in a systemised way), the sound vibrations gather force from the Yantra( a geometric figure inscribed on a metallic plate or paper and is the confluence of the powers of the concerned God) and after reflecting from its surface spread out into the universe and reach the concerned God.