From the mundane viewpoint , Brahman as the supreme deity remains linked with empirical measurement , the number "one ", but from the transcendental point of view ( the state of unchanging eternal being ) Brahman is the limitless and aattributeles Absolute where all opposites are reconciled .
Hence speculative monoism has existed alongside ritualistic polytheism from Vedic times to the present day thereby emphasising that reality is inexhaustible , beyond name and form , pervading and transcending all existence and earthly knowledge .
The vedic Gods were thought to rely on humankind's sacrificial offerings which sustained them ,and also kept the world process moving . But neither the Vedic Gods nor the other Hindu Gods are solely concerned with human welfare (in distinction with other religions ) for , Man is only a part of nature , in common with all other living things.
As classical Hinduism evolved out of a synthesis of Aryan , Dravidian, tribal and aborginal cults the old Vedic Gods of nature became less important and other Gods like Vishnu and Siva became important , by the 3rd century AD .
The formless Brahman in his personal form with attributes became Iswara ( for the followers of Siva ) or Narayana ( for the followers of Vishnu ). Along with Brahma ( "the secondary creator") , the three divine aspects of Brahman came to be known as the Trimurti , Brahma being the Creator , Vishnu the Preserver and Siva the Destroyer of the world .
Brahma is believed to grant knowledge , Vishnu liberation from rebirth , and Siva all worldly boons .