Mbh 12.350.5b

When Hari beheld that Brahma had become united with Intelligence, He once more addressed him, saying--'Do thou now create diverse kinds of creatures.'--Replying unto Narayana by uttering the word 'Yes,' Brahma reverently accepted the command of his progenitor. Narayana then disappeared from Brahma's presence, and in a moment repaired to his own place, known by the name of Deva (Light or Effulgence). Returning to His own disposition (of Unmanifestness), Hari remained in that state of oneness. After the task of creation, however, had been accomplished by Brahma, another thought arose in the mind of Narayana. Indeed, he reflected in this strain:--'Brahma, otherwise called Parameshthi, has created all these creatures, consisting of Daityas and Danavas and Gandharvas and Rakshasas. The helpless Earth has become burthened with the weight of creatures. Many among the Daityas and Danavas and Rakshasas on Earth will become endued with great strength. Possessed of penances, they will at diverse times succeed in acquiring many excellent boons. Swelling with pride and might in consequence of those boons that they will succeed in obtaining, they will oppress and afflict the deities and the Rishis possessed of ascetic might. It is, therefore, meet that I should now and then lighten the burthen of the Earth, by assuming diverse forms one after another as occasion would require. I shall achieve this task by chastising the wicked and upholding the righteous. (Thus looked after by me), the Earth, which is the embodiment of Truth, will succeed in bearing her load of creatures. Assuming the form of a mighty snake I myself have to uphold the Earth in empty space. Upheld by me thus, she will uphold the entire creation, mobile and immobile. Incarnated on the Earth, therefore, in different forms, I shall have to rescue her at such times from peril.