Ānandamaya-kośa
Sheath made of bliss
The innermost sheath, ānandamaya — made of bliss. Taittirīya II.5 calls it the inmost shape filled by joy as its head, by satisfaction as its right wing, by great-joy as its left wing, and by Brahman as its tail and supporting ground. It is associated with the cave of the heart (hṛd-guhā) where deep sleep dissolves discursive mind into undifferentiated rest. Classical Advaita is precise: ānandamaya is still a kośa — a covering. Brahman is its support, not its synonym. The contemplative passes through, not into, this last veil.
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Taittirīya Upaniṣad II.5 (primary_canonical)
“Joy is its head, satisfaction its right wing, great satisfaction its left wing, bliss its trunk, Brahman its tail and support.”