Text 18]
Chanting the Song Sung by Lord Śiva
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his pastime in the form of Śaṅkarācārya, he preached the Vaiṣṇava philosophy:  bhaja govindaṁ bhaja govindaṁ bhaja govindaṁ mūḍha-mate . He stressed worshiping Lord Kṛṣṇa or Govinda three times in this verse and especially warned his followers that they could not possibly achieve deliverance or  mukti  simply by word jugglery and grammatical puzzles. If one is actually serious to attain  mukti , he must worship Lord Kṛṣṇa. That is Śrīpāda Śaṅkarācārya's last instruction.
Herein it is mentioned that Lord Śiva is always accompanied by his material energy ( śaktyā ghorayā ). Material energy—Goddess Durgā or Goddess Kālī—is always under his control. Goddess Kālī and Durgā serve him by killing all the  asuras  or demons. Sometimes Kālī becomes so infuriated that she indiscriminately kills all kinds of  asuras . There is a popular picture of Goddess Kālī in which she wears a garland composed of the heads of the  asuras  and holds in her left hand a captured head and in her right hand a great  khaḍga , or chopper, for killing  asuras . Great wars are symbolic representations of Kālī's devastation of the  asuras  and are actually conducted by the Goddess Kālī.
sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā chāyeva yasya bhuvanāni bibharti durgā  (Bs. 5.44)
Asuras , however, try to pacify the Goddess Kālī or Durgā by worshiping her in material opulence, but when the  asuras  become too intolerable, Goddess Kālī does not discriminate in killing them wholesale.  Asuras  do not know the secret of the energy of Lord Śiva, and they prefer to worship Goddess Kālī or Durgā or Lord Śiva for material benefit. Due to their demonic character, they are reluctant to surrender to Lord Kṛṣṇa, as indicated by  Bhagavad-gītā :
na māṁ duṣkṛtino mūḍhāḥ prapadyante narādhamāḥ māyayāpahṛta-jñānā āsuraṁ bhāvam āśritāḥ  (Bg. 7.15)
Lord Śiva's duty is very dangerous because he has to employ the energy of Goddess Kālī (or Durgā). In another popular picture the Goddess Kālī is sometimes seen standing on the prostrate body of Lord Śiva, which indicates that sometimes Lord Śiva has to fall down flat in order to stop Goddess Kālī from killing the  asuras . Since Lord Śiva controls the great material energy (Goddess Durgā), worshipers of Lord Śiva attain very opulent positions within this material world. Under Lord Śiva's direction, a