Tripuratapini Upanishad

It is classified as one of the eight Shakta Upanishads and attached to the Atharvaveda. The Upanishad is a notable goddess and tantra related text. It asserts that the universe was created by the union of Shiva and Shakti, that all existence is interdependent on both the feminine and the masculine. The text presents Tripura, as the primordial power, as the great goddess of three cities, tantra chakras (yantra) as means of her worship, the wheel of kamakala and describes mantras to remember her. The last chapter of the Upanishad is an Advaita-style discussion of goddess (Shakti) as the ultimate reality Brahman with the text asserting that one's Atman (self, soul) is identical with the Brahman. These philosophical premises of Tripuratapini Upanishad belong to the Shaktadavaitavada tradition (literally, the path of nondualistic Shakti).