Adi Sankara states (regarding Vishnu Purana, 3.1.45): "The Power of the Supreme Being has entered within the universe. The root means 'enter into.'" Swami Chinmayananda, in his translation of Vishnu sahasranama further elaborates on that verse: The root Vis means to enter. The entire world of things and beings is pervaded by Him and the Upanishad emphatically insists in its mantra "whatever that is there is the world of change." Hence, it means that He is not limited by space, time or substance. Chinmayananda states that which pervades everything is Vishnu.
This is further supported in the Skanda purana by atreya Rsi that Lord Vishnu is the Sole Godhead and other demigods are just His different energies.
The sacrifice was meant to bring about the destruction of Indra. But the rsis,who used to worship indra as a demigod were intelligent enough to alter a single pronunciation of the ved-mantra. The purpose of the entire sacrifice was reversed. When the fruit of the sacrifice was given, as in when the demon was on the verge of dying, he clearly calls out to lord Vishnu,whom he addresses as Supreme Godhead and "the father of all living entities including himself". Aitareya Brahmana: 1:1:1 mentions Vishnu as the Supreme God.
The upanishads,right from Gopal tapani upanishad to the Brhad ranya upanishad state His Godhood.The Katha-upanishad, describes Vishnu in supremacy - He who has no understanding, who is unmindful and always impure, never reaches that place, but enters into the round of births. But he who has understanding, who is mindful and always pure, reaches indeed that place, from whence he is not born again. But he who has understanding for his charioteer (intellect), and who holds the reins of the mind, he reaches the end of his journey, and that is the highest place of Vishnu.
Other important qualities attributed to Vishnu are Gambhirya (inestimatable grandeur), Audarya (generosity), and Karunya (compassion.) The Rigveda says: Vishnu can travel in three strides. The first stride is the Earth. The second stride is the visible sky. The third stride cannot be seen by men and is the heaven where the gods and the righteous dead live. (This feature of three strides also appears in the story of his avatar Vamana called Trivikrama.) The Sanskrit for "to stride" is the root kram ; its reduplicated perfect tense is chakram ( grade) or chakra (zero-grade), and in the Rigveda he is called by epithets such as = "he who has made 3 strides". The Sanskrit word chakra also means "wheel". That may have suggested the idea of Vishnu carrying a chakra.
Maya is the samvit (the primary intelligence) of Vishnu, while the other five attributes emerge from this samvit and hence Maya is his ahamata, activity, or Vishnu's Power. This power of god, Maya or Shakti, is personified and is called Shri or Lakshmi, Maya, Vishnumaya, or Mahamaya, and She is said to manifest Herself in, 1) kriyshakti, (Creative Activity) and 2) bhtishakti (Creation) of Universe. Hence this world cannot part with his creativity i.e., ahamta, which is a feminine form which in its feminine form is called Shri or Lakshmi or Maya. He therefore needs consort Goddess Lakshmi to be with Him always, untouched by any. Thus goddess Lakshmi has to accompany Vishnu in all His incarnations.
In the Brahma Vaivarta Purana, verses 2.6.13-95 it is described that Vishnu has three wives, who constantly quarrel with each other, so that eventually, he keeps only Lakshmi, giving Ganga to Shiva and Saraswati to Brahma.
A verse of the Vishnu Sahasranama stotram states; "vanaml gadh shrng shanki chakri cha nandaki / shrmn nryao vio vsudevo abhirakatu//" ; translation: Protect us Oh Lord Narayana who wears the forest garland,who has the mace, conch , sword and the wheel. And who is called Vishnu and the Vasudeva.
The character Bhishma recites the names before Krishna on the battlefield of Kurukshetra, praising him (Vishnu) as the supreme god. These Sahasranama are regarded as essence of all Vedas by followers of Vaishnavism who believe sincere chanting of Vishnu Sahasranama results in spiritual well-being and a greater awareness of god.
Source: Wikipedia > Vishnu
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