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According to an esoteric explanation, the Sanskrit term mantra signifies “that which protects (trāna) the mind (manas). Specifically, mantra is a sound (letter, syllable, word, or phrase) that is charged with transformative power, such as the letter a, the sacred syllable om, the word hamsa, or the phrase om mani padme hūm. Thus a mantra could be explained as a potentized sound by which specific effects in consciousness can be produced. Most high-minded practitioners are reluctant to use mantras for anything other than the greatest human goal (purusha-artha, written purushārtha), which is liberation. In Tantric rituals, mantras are used to purify the altar, one’s seat, implements such as vessels and offering spoons, or the offerings themselves (e.g., flowers, water, food), or to invoke deities, protectors, and so on. Yet, the science of sacred sound (mantra-shāstra) has since ancient times been widely put to secular use as well. In this case, mantras assume the character of magical spells rather than sacred vibrations in the service of self-transformation and self-transcendence. The serpent energy hidden in the body is associated with the Sanskrit alphabet constituted of fifty basic letters, or sound vibrations, which go into the making of mantras. In contrast to ordinary words, however, mantras most often do not have a particular meaning, and their potency is tapped into through frequent repetition, whether mentally, whispered, or aloud. It is not commonly understood that for a sound to be a mantra, it must have been given in the context of initiation (dīkshā), whether formally or informally. Only then does the mantra have truly transformative power. For a mantra to become “active” or “awakened,” it must be recited at least 100,000 times. A mantra lacking in “consciousness” is just like any other sound. As the Kula-Arnava-Tantra (15.61–64) states: Mantras without consciousness are said to be mere letters. They yield no result even after a trillion recitations. The state that manifests promptly when the mantra is recited [with “consciousness”], that result is not [to be gained] from a hundred, a thousand, a hundred thousand, or ten million recitations. O Kuleshvarī, the knots at the heart and throat are pierced, all the limbs are invigorated, tears of joy, gooseflesh, bodily ecstasy, and tremulous speech suddenly occur for sure . . . . . . when a mantra endowed with consciousness is uttered even once. Where such signs are seen, that [mantra] is said to be according to tradition. Mantras of concentrated potency are known as “seed syllables” (bīja). Om is the original seed syllable, the source of all others. The Mantra-Yoga-Samhitā (71) calls it the “best of all mantras,” adding that all other mantras receive their power from it. Thus om is prefixed or sometimes also suffixed to numerous mantras, such as om namah shivāya
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