The Shodashi Mantra, also known as the sixteen-syllable mantra of Sri Vidya, is considered the most secret and powerful mantra of Tripura Sundari, the goddess of supreme consciousness. According to the 'Lalita Sahasranama' (verse 184), the goddess is praised as 'Shodashi' (the sixteen-year-old), representing the fullness of youth and the sixteen phases of the moon. The mantra is composed of sixteen seed syllables (bījākṣaras) that correspond to the sixteen vowels of the Sanskrit alphabet, as detailed in the 'Mantra Mahodadhi' (Chapter 5). These syllables are: 'Ka, E, I, La, Hrīm, Ha, Sa, Ka, Ha, La, Hrīm, Sa, Ka, La, Hrīm' — each carrying specific energies that activate the sixteen kalās (aspects) of the goddess. The 'Shaktisangama Tantra' (Tārākhanda) describes this mantra as the condensed form of the entire Sri Vidya tradition, capable of granting both worldly prosperity and ultimate liberation (kaivalya). The bīja 'Hrīm' appears three times, representing the creative, preservative, and dissolutive powers of the goddess. The mantra is traditionally chanted in conjunction with the worship of the Sri Chakra, as outlined in the 'Yoginī Hṛdaya' (a key text of Sri Vidya). Recommended chanting context includes early morning or during the full moon (pūrṇimā), with a minimum of 108 repetitions daily, though advanced practitioners may perform 1,008 repetitions. The 'Devi Mahatmya' (Chapter 11) emphasizes that such mantras should be received from a qualified guru (guru-dīkṣā) to avoid spiritual pitfalls. Cautions include the necessity of strict purity (śauca) and adherence to dietary restrictions (sāttvika food). Improper chanting without proper initiation is said to lead to adverse effects, as warned in the 'Mantra-Yoga-Samhita' (Chapter 3). The mantra is most effective when chanted with visualization of the goddess as a sixteen-year-old maiden seated on the Sri Chakra, surrounded by the sixteen Nityā deities. This practice is considered the pinnacle of Tantric sādhana, leading to the realization of non-dual consciousness (advaita).
Sri Chakra with Tripura Sundari at the center, representing the sixteen phases of the moon and cosmic consciousness.