Devi Upanishad
It is one of the 19 Upanishads attached to the Atharvaveda, and is classified as one of the eight Shakta Upanishads.
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The Upanishad states that the Goddess is the Brahman (ultimate metaphysical Reality), and from her arise Prakṛti (matter) and Purusha (consciousness). She is bliss and non-bliss, the vedas and what is different from it, the born and the unborn, and all of the universe.