The specific mantra spoken by a yogi is connected to a mantra devata, the divine force that gives the mantra its spiritual power. It is believed that there are about 70 million mantras. Each mantra has its own sound and vibration, so when chanted by the yogi, he/she begins to vibrate within the frequency of that mantra. Some say that the vibrational power of each specific mantra is the power of the deity that presides over it. It is also said that the vibrations of the mantra can have healing effects, penetrating into the cells of the body and filling them with divine energy and strength.
Mantra yoga uses repetition and chanting of mantras to encourage the mind to enter into a meditative state, so that the chanter may begin to connect with the Divine within him/herself. It is said that in choosing to chant mantras, the yogi is changing his/her vibration and evoking a higher level of consciousness.