Kurma (Sanskrit: कूर्म, lit. 'Turtle' or 'Tortoise'), is the second avatar of the Hindu preserver deity, Vishnu. Originating in Vedic literature such as the Yajurveda as being synonymous with the Saptarishi called Kashyapa, Kurma is most commonly associated in post-Vedic literature such as the Puranas. He prominently appears in the legend of the churning of the Ocean of Milk, referred to as the Samudra Manthana. Along with being synonymous with Akupara, the World-Turtle supporting the Earth, Kurma is listed as the 2nd avatar in the Dashavatara, which are the ten principal incarnations of Vishnu.
Nomenclature and etymology The Sanskrit word 'Kurma' (Devanagari: कूर्म) means 'Tortoise' and 'Turtle'. The tortoise incarnation of Vishnu is also referred to in post-Vedic literature such as the Bhagavata Purana as 'Kacchapa' (कच्छप), 'Kamaṭha' (कमठ), 'Akupara' (अकूपार), and 'Ambucara-Atmana' (अम्बुचर-आत्मना), all of which mean 'tortoise' or 'form of a tortoise'.
The Nirukta Written by the grammarian Yaska, the Nirukta is one of the six Vedangas or 'limbs of the Vedas', concerned with correct etymology and interpretation of the Vedas. The entry for the Tortoise states (square brackets '[ ]' are as per the original author):May we obtain that illimitable gift of thine. The sun is called akupara also, i. e. unlimited, because it is immeasurable. The ocean, too, is called akupara, i. e. unlimited, because it is boundless. A tortoise is also called a-kupa-ara, because it does not move in a well [On account of its shallowness]. Kacchapa (tortoise) is (so called because) it protects (pati) its mouth (kaccham), or it protects itself by means of its shell (kacchena), or it drinks (√pa) by the mouth. Kaccha (mouth or shell of a tortoise) = kha-ccha, i. e. something which covers (chddayatl) space (kham). This other (meaning of) kaccha, 'a bank of a river', is derived from the same (root) also, i.e. water (kam) is covered (chadyate) by it.
Kashyapa As illustrated below, Vedic literature such as the Samaveda and Yajurveda explicitly state Akupara/Kurma and the sage Kashyapa are Synonymous. Kashyapa - also meaning 'Tortoise' - is considered the Progenitor of all living beings with his thirteen wives, including vegetation, as related by H.R. Zimmer:
Ira [meaning 'fluid']... is known as the queen-consort of still another old creator-god and father of creatures, Kashyapa, the Old Tortoise Man, and as such she is the mother of all vegetable life. The legend of the churning of the Ocean of Milk (Samudra Manthana) developed in post-Vedic literature is itself inextricably linked with Kurma (as the base of the churning rod) and involves other sons of Kashyapa: the devas/adityas (born from Aditi) and the asuras/Danavas/Daityas (born from Danu and Diti) use one of the Naga (born from Kadru) as a churning rope to obtain Amrita. Garuda, the king of birds and mount of Vishnu, is another son of Kashyapa (born from Vinata) often mentioned in this legend. In another, Garuda seeks the Amrita produced (eating a warring Elephant And Tortoise in the process) to free his mother and himself from enslavement from Kadru.
Yoga Kurmasana (Tortoise Posture) is a Yoga posture. 'Panikacchapika' (Sanskrit पाणिकच्छपिका), meaning 'Hand Tortoise', is a special positioning of the fingers during worship rituals to symbolise Kurma. The Kurmacakra is a Yantra, a mystical diagram for worship, in the shape of a tortoise. These are all mentioned in the Upanishads and Puranas (see below).
Symbolism
The Dashavataras are compared to evolution; Kurma - the amphibian - is regarded the next stage after Matysa, the fish. Firmness / Steadiness: W. Caland notes that in relation to 'Akupara Kashyapa' in the Pancavimsa Brahmana and Jaiminiya Brahmana, the tortoise is equal to 'a firm standing... and Kashyapa (The Tortoise) is able to convey (them) across the sea [of material existence]'. P.N. Sinha seems to support this view, adding 'Kurma was a great Avatara as He prepared the way for the spiritual regeneration of the universe, by the Churning of the Ocean Of Milk'. Deity Yajna-Purusha: N. Aiyangar states that as the tortoise was 'used as the very basis of the fire Altar, the hidden invisible tortoise, taken together with the altar and the sacred fire, seems to have been regarded as symbolizing the Deity Yajna-Purusha who is an invisible spiritual god extending from the fire altar up to heaven and everywhere... this seems to be the reason why the tortoise is identified with the sun'. Meditation / Churning the Mind: Aiyangar also surmises that the legend of the Samudra Manthana symbolises churning the mind through Meditation to achieve liberation (Moksha). Based on the mention of Vatarasanaḥ ('Girdled By The Wind') Munis in the Taittirtya Aranyaka - also referred to as urdhvamanthin, meaning 'those who churn upwards' - and the explanation provided in the Shvetashvatara Upanishad, Aiyangar believes this would 'appear to be the hidden pivot on which the gist of the riddle of the Puranic legend about the Churning For Nectar turns'. R. Jarow seems to agree, stating the churning of the Ocean of Milk represents the 'Churning Of The Dualistic Mind'.
Ascetic Penance: H.H. Wilson notes that 'the account [of the Samudra Manthana] in the Hari Vamsa... is explained, by the commentator, as an Allegory, in which the churning of the ocean typifies ascetic penance, and the Ambrosia is final Liberation' (Linking With The Idea Of 'Steadiness' And 'Firmness'), but personally dismisses this interpretation as 'Mere Mystification' (Note 1, pp. 146). Astronomy: B.G. Sidharth states that the legend of the Samudra Manthana symbolises astronomic phenomena, for example that 'Mandara represents the polar regions of Earth [and the] Churning Rope, Vasuki, symbolizes the slow annual motion of Earth... Vishnu, or the Sun himself rests upon a coiled snake... which represents the rotation of the Sun on its own axis'. In regards to the tortoise supporting the Earth, Sidharth adds that the 'Twelve Pillars... are evidently the twelve months of the year, and... The four elephants on which Earth rests are the Dikarin, the sentinels of the four directions.. [Kurma] symbolizes the fact that Earth is supported in space in its annual orbit around the Sun'.
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