In the Mahābhārata there are incorporated two documents of first-rate importance for the doctrines of the churches that worshipped Vishṇu. One of these is the Bhagavad-gītā, or Lord's Song (VI. xxv.-xlii.); the other is the Nārāyaṇīya, or Account of Nārāyaṇa (XII. cccxxxvi.-cccliii.). Their teachings are not the same in details, though on most main points they agree; for they belong to different sections of the one religious body. Leaving aside the Bhagavad-gītā for the moment, we note that the Nārāyaṇīya relates a story that there were born four sons of Dharma, or Righteousness, viz. Nara, Nārāyaṇa, Hari or Vishṇu, and Kṛishṇa. In other places (I. ccxxx. 18, III. xii. 45, xlvii. 10, V. xlviii. 15, etc.) we are plainly told that Nara is a previous incarnation of Arjuna the Pāṇḍava prince, and Nārāyaṇa is, of course, the supreme Deity, who in the time of Arjuna was born on earth as Kṛishṇa Vāsudēva, and that in his earlier birth Nara and Nārāyaṇa were both ascetic saints. This tradition is very important, for it enables us to see something of the early character of Nārāyaṇa. He was an ancient saint of legend, who was connected with a hero Nara, just as Kṛishṇa was associated with Arjuna; and the atmosphere of saintliness clings to him obstinately. Tradition alleges that he was the _ṛishi_, or inspired seer, who composed the Purusha-sūkta of the Ṛig-vēda (X. 90), and represents him by choice as lying in a _yōga-nidrā_, or mystic sleep, upon the body of the giant serpent Śēsha in the midst of the Ocean of Milk. Thus the worship of Vishṇu, like the worship of Śiva, has owed much to the influence of live yōgīs idealised as divine saints; though it must be admitted that the yōgīs of the Vaishṇava orders have usually been more agreeable and less ambiguous than those of the Śaiva community. We must briefly consider now the religious teachings of the Bhagavad-gītā and the Nārāyaṇīya, and then turn to the inscriptions and contemporary literature to see whether we can find any sidelights in them. We begin with the Bhagavad-gītā, or The Lord's Song.