The Tantric Secret Seed Syllables of the Seven Hundred Verses to Durga

...in his commentary on the Brahma Sutras, maintains that the Supreme Power original: "para-shakti" is spread throughout the entire universe. He interprets "ishavasyam" as "abode of the Lord," meaning: "This whole world is the abode of the Supreme Brahman in the form of Supreme Power." Therefore, only a practitioner who uses whatever is available in the world with a spirit of renunciation, and who accepts it as a gift original: "prasad", attains the grace of the Supreme Mother. The Kilaka a protective or pinning hymn makes this sentiment clearer by stating that the Goddess is pleased only with the devotee who, having received Shakta initiation, dedicates all his earned and accumulated possessions to the Goddess on the eighth or fourteenth day of the dark fortnight with a focused mind, and then, having relinquished his rights, accepts them back for use as a gift. Otherwise, her pleasure is not attained:

On the fourteenth or eighth day of the dark fortnight, with a focused mind,

he gives and receives; otherwise, she is not pleased.

The three characters of the Saptashati—the first, middle, and final—represent the pastimes of Mahakali, Mahalakshmi, and Mahasaraswati, respectively. In the Vedas, they are addressed by the names Amba, Ambika, and Ambalika. At the end of each chapter of the Saptashati, there is a protocol to offer oblations using this Shruti from the Yajurveda (23/15):

O Amba, O Ambika, O Ambalika, no one leads me.
The horse-rider sleeps, [the one who is] beautiful, living in Kampila.

The interpretation Uvvata and Mahidhara gave to this mantra while utilizing it in the context of the Ashvamedha sacrifice does not align with the Shakta perspective. In my view, Amba is the signifier of the fire element located in the Earth; Ambika is the signifier of the air element located in the Atmosphere; and Ambalika is the signifier of the solar element located in the Heaven. The first is established as the form of the Rigveda, the second as the form of the Yajurveda, and the third as the form of the Samaveda. In the fourth chapter of the Saptashati, the gods prayed:

You are the essence of sound, the cause of the immaculate Rig and Yajur mantras, and the base of the Samaveda with its charmingly recited Udgitha.
You are the Triple Goddess, the Divine Lady, for the prosperity of the world, and the destroyer of the supreme suffering of all worlds.