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The striking difference between the earlier and later phases of Indian religious belief, between the Vedic hymns, Brahmanas, Upanishads and their accessory treatises on the one hand, and the epics, Puranas, Tantras and later literature on the other, is due chiefly to the predominance in the latter of the great gods Siva and Vishnu, with the attendant features of sectarian worship and personal devotion to a particular deity. The difference is not wholly chronological, for late writers sometimes take the Vedic standpoint and ignore the worship of these deities, but still their prominence in literature, and probably in popular mythology, is posterior to the Vedic period. The change created by their appearance is not merely the addition of two imposing figures to an already ample pantheon; it is a revolution which might be described as the introduction of a new religion, except that it does not come as the enemy or destroyer of the old. The worship of the new deities grows up peacefully in the midst of the ancient rites; they receive the homage of the same population and the ministrations of the same priests. The transition is obscured but also was facilitated by the strength of Buddhism during the period when it occurred. The Brahmans, confronted by this formidable adversary, were disposed to favour any popular religious movement which they could adapt to their interests.
When the Hindu revival sets in under the Guptas, and Buddhism begins to decline, we find that a change has taken place which must have begun several centuries before, though our imperfect chronology does not permit us to date it. Whereas the Vedic sacrificers propitiated all the gods impartially and regarded ritual as a sacred science giving power over nature, the worshipper of the later deities is generally sectarian and often emotional. He selects one for his adoration, and this selected deity becomes not merely a great god among others but a gigantic cosmical figure in whom centre the philosophy, poetry and passion of his devotees. He is almost God in the European sense, but still Indian deities, though they may have a monopoly of adoration in their own sects, are never entirely similar to Jehovah or Allah. They are at once more mythical, more human and more philosophical, since they are conceived of not as creators and rulers external to the world, but as forces manifesting themselves in nature. An exuberant mythology bestows on them monstrous forms, celestial residences, wives and offspring: they make occasional appearances in this world as men and animals; they act under the influence of passions which if titanic, are but human feelings magnified. The philosopher accommodates them to his system by saying that Vishnu or Siva is the form which the Supreme Spirit assumes as Lord of the visible universe, a form which is real only in the same sense that the visible world itself is real.