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Śrīmad-Bhāgavatam
[Canto 5, Ch. 23]
“The external potency,  māyā , who is of the nature of the shadow of the  cit  [spiritual] potency, is worshiped by all people as Durgā, the creating, preserving and destroying agency of this mundane world. I adore the primeval Lord Govinda, in accordance with whose will Durgā conducts herself.” Material nature, the external energy of the Supreme Lord, is also known as Durgā, or the female energy that protects the great fort of this universe. The word Durgā also means fort. This universe is just like a great fort in which all the conditioned souls are kept, and they cannot leave it unless they are liberated by the mercy of the Supreme Personality of Godhead. The Lord Himself declares in  Bhagavad-gītā  (4.9):
janma karma ca me divyam evaṁ yo vetti tattvataḥ tyaktvā dehaṁ punar janma naiti mām eti so 'rjuna
“One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.” Thus simply by Kṛṣṇa consciousness, by the mercy of the Supreme Personality of Godhead, one can be liberated, or, in other words, one can be released from the great fort of this universe and go outside it to the spiritual world.
It is also significant that the predominating deities of even the greatest planets have been offered their exalted posts because of the very valuable pious activities they performed in previous births. This is indicated herein by the words  karma-nirmita-gatayaḥ . For example, as we have previously discussed, the moon is called  jīva , which means that he is a living entity like us, but because of his pious activities he has been appointed to his post as the moon-god. Similarly, all the demigods are living entities who have been appointed to their various posts as the masters of the moon, the earth, Venus and so on because of their great service and pious acts. Only the predominating deity of the sun, Sūrya Nārāyaṇa, is an incarnation of the Supreme Personality of Godhead. Mahārāja Dhruva, the predominating deity of Dhruvaloka, is also a living entity. Thus there are two kinds of entities—the supreme entity, the Supreme Personality of Godhead, and the ordinary living entity, the  jīva  ( nityo