Mantra yoga involves the chanting of mantras or sacred formulas to produce powerful vibrations. The most potent mantra is the syllable "Aum" which represents the Hindu trinity of Brahma, Vishna, and Shiva. For a mantra to be effective, it must be chanted with strong intent and feeling, not just mechanically repeated. There are different types of mantras that have varying levels of assistance in achieving spiritual goals. Mantra yoga is considered an easy path to God realization in current times according to Swami Sivananda.