A subtle body is one of a series of psycho-spiritual constituents of living beings, according to various esoteric, occult, and mystical teachings. According to such beliefs each subtle body corresponds to a subtle plane of existence, in a hierarchy or great chain of being that culminates in the physical form. According to Bhagavad Gita, one of the most sacred texts of Hinduism, the subtle body is composed of mind, intelligence and ego, which controls the gross physical body. It is also known in different other spiritual traditions: “the most sacred body” (wujud al-aqdas) and “true and genuine body” (jism asli haqiqi) in Sufism, “the diamond body” in Taoism and Vajrayana, “the light body” or “rainbow body” in Tibetan Buddhism, “the body of bliss” in Kriya Yoga, and “the immortal body” (soma athanaton) in Hermeticism. The various attributes of the subtle body are frequently described in terms of often obscure symbolism: Tantra features references to the sun and moon as well as various Indian rivers and deities, while Taoist alchemy speaks of cauldrons and cinnabar fields.