गान्धर्व तन्त्र (शैव-शाक्त आगम - मन्त्र-रहस्य, यन्त्र एवं देवतोपासना सटीक)

According to the real meaning the practitioner has to
merge himself in the Transcendental Self.
30th CHAPTER
The three parts of the incantation of Devī known by
the terms Vāgbhava, Kāmarāja and Śakti together with the
Hamsa-mantra are described in this chapter. ह and स of हंस are
said to be representative of the vital breath and the soul,
existence and intelligence, Śiva and Śakti. This mantra is called
Ajapā because it is not to be muttered but to be meditated upon
so much so that the practitioner is to realize his unity with
the Transcendental Self. Of the Mātṛkā of the Sanskrit
alphabet, vowels constitute the breath, and Bindu and
Visarga consciousness. Every incantation becomes lifeless
as it were, if not possessing Bindu, Visarga, ह, स and ई श्रीं ह्रीं.
हंस ऐँ क्लीं सौः ह्रीँश्रीँ is supposed to vitalise every mantra as
do Bodhinī and Dīpinī. Meditation on Kuṇḍalinī in the form
of a flame, if accompanied by the 3 Kūṭas above referred
to, leads the practitioner to acquire respectively extraordinary
wisdom, power of charming and immunity from the effect
of poison.
The meaning of Kāmakalā and what it stands for
and other details regarding the same are given at the end
of the chapter.