Looking at the Cultural Background
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Indra , and all other demigods. He has not mentioned, however, the  name  of Viṣṇu because Viṣṇu is identical with Kṛṣṇa. The  Vedas  and the  Upaniṣads  are meant for understanding the process by which one can surrender unto Kṛṣṇa. The yogis try to see Him (Kṛṣṇa) within themselves  by  meditation. In other words, it is for all the demigods and demons who  do  not know where the ultimate end is that Śaṅkara teaches, and he  especially  instructs the demons and the fools to offer salutations to Kṛṣṇa  and  His words, the  Bhagavad-gītā , by following in his footsteps. Only by  such  acts will the demons be benefited, not by misleading their innocent followers by so-called mental speculations or showbottle meditations.  Śaṅkara  directly offers salutations to Kṛṣṇa, as if to show the fools, who  are  searching after light, that  here is light like the sun . But the fallen demons are like owls that will not open their eyes on account of their fear  of  the sunlight itself. These owls will never open their eyes to see the  sublime  light of Kṛṣṇa and His words the  Bhagavad-gītā . They will,  however , comment on the  Gītā  with their closed owl-eyes to mislead  their  unfortunate readers and followers.  Śaṅkara , however, discloses the  light  to his less intelligent followers and shows that the  Bhagavad-gītā  and  Kṛṣṇa  are the only source of light. This is all to teach the sincere seekers  of  truth to offer salutation to Lord Kṛṣṇa and thus surrender unto Him  without  misgivings. That is the highest perfection of life, and that is the  highest  teaching of Śaṅkara, the great learned scholar whose teachings  drove  the voidist philosophy of Buddha out of India, the land of  knowledge .  Oṁ tat sat .