Annapoorna Upanishad
It is classified as a Samanya Upanishads and attached to the Atharvaveda. The text is structured as a discourse between yogin Nidagha and Vedic sage Ribhu.
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The first chapter presents a series of questions such as "Who am I? How did the universe come about? what is the meaning of birth, death and life? what is freedom and liberation?" The text then discusses its answers, after attributing the knowledge to goddess Annapurna.
The text is notable for describing five types of delusions, asserting the Advaita Vedanta doctrine of non-duality and oneness of all souls and the metaphysical Brahman, defining spiritual liberation as being unattached to anything and freedom from inner clingings. The text describes Jivanmukti – achieving freedom in this life, and the characteristics of those who reach self-knowledge.
