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The striking difference between the earlier and later phases of Indian religious belief, between the Vedic hymns, Brâhmaṇas, Upanishads and their accessory treatises on the one hand, and the epics, Purâṇas, Tantras and later literature on the other, is due chiefly to the predominance in the latter of the great gods Śiva and Vishṇu, 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 Vishṇu or Śiva 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.
Vishṇu and Rudra are known even to the Ṛig Veda but as deities of no special eminence. It is only after the Vedic age that they became, each for his own worshippers, undisputed Lords of the Universe. A limiting date to the antiquity of Śivaism and Vishnuism, as their cults may be called, is furnished by Buddhist literature, at any rate for north-eastern India. The Pali Piṭakas frequently[334] introduce popular deities, but give no prominence to Vishṇu and Śiva. They are apparently mentioned under the names of Veṇhu and Isâna, but are not differentiated from a host of spirits now forgotten. The Piṭakas have no prejudices in the matter of deities and their object is to represent the most powerful of them as admitting their inferiority to the Buddha. If Śiva and Vishṇu are not put forward in the same way as Brahmâ and Indra, the inference seems clear: it had not occurred to anyone that they were particularly important.
The suttas of the Dîgha Nikâya in which these lists of deities occur were perhaps composed before 300 B.C.[335] About that date Megasthenes, the Greek envoy at Pataliputra, describes two Indian deities under the names of Dionysus and Herakles. They are generally identified with Kṛishṇa and Śiva. It might be difficult to deduce this identity from an analysis of each description and different authorities have identified both Śiva and Kṛishṇa with Dionysus, but the fact remains that a somewhat superficial foreign observer was impressed with the idea that the Hindus worshipped two great gods. He would hardly have derived this idea from the Vedic pantheon, and it is not clear to what gods he can refer if not to Śiva and Vishṇu. It thus seems probable that these two cults took shape about the fourth century B.C. Their apparently sudden appearance is due to their popular character and to the absence of any record in art. The statuary and carving of the Asokan period and immediately succeeding centuries is exclusively Buddhist. No temples or images remain to illustrate the first growth of Hinduism (as the later form of Indian religion is commonly styled) out of the earlier Brahmanism. Literature (on which we are dependent for our information) takes little account of the early career of popular gods before they win the recognition of the priesthood and aristocracy, but when that recognition is once obtained they appear in all their majesty and without any hint that their honours are recent.
As already mentioned, we have evidence that in the fifth or sixth century before Christ the Vedic or Brahmanic religion was not the only form of worship and philosophy in India. There were popular deities and rites to which the Brahmans were not opposed and which they countenanced when it suited them. What takes place in India to-day took place then. When some aboriginal deity becomes important owing to the prosperity of the tribe or locality with which he is connected, he is recognized by the Brahmans and admitted to their pantheon, perhaps as the son or incarnation of some personage more generally accepted as divine. The prestige of the Brahmans is sufficient to make such recognition an honour, but it is also their interest and millennial habit to secure control of every important religious movement and to incorporate rather than suppress. And this incorporation is more than mere recognition: the parvenu god borrows something from the manners and attributes of the olympian society to which he is introduced. The greater he grows, the more considerable is the process of fusion and borrowing. Hindu philosophy ever seeks for the one amongst the many and popular thought, in a more confused way, pursues the same goal. It combines and identifies its deities, feeling dimly that taken singly they are too partial to be truly divine, or it piles attributes upon them striving to make each an adequate divine whole.
Among the processes which have contributed to form Vishṇu and Śiva we must reckon the invasions which entered India from the north-west.[336] In Bactria and Sogdiana there met and were combined the art and religious ideas of Greece and Persia, and whatever elements were imported by the Yüeh-chih and other tribes who came from the Chinese frontier. The personalities of Vishṇu and Śiva need not be ascribed to foreign influence. The ruder invaders took kindly to the worship of Śiva, but there is no proof that they introduced it. But Persian and Græco-Bactrian influence favoured the creation of more definite deities, more personal and more pictorial. The gods of the Vedic hymns are vague and indistinct: the Supreme Being of the Upanishads altogether impersonal, but Mithra and Apollo, though divine in their majesty, are human in their persons and in the appeal they make to humanity. The influence of these foreign conceptions and especially of their representation in art is best seen in Indian Buddhism. Hinduism has not so ancient an artistic record and therefore the Græco-Bactrian influence on it is less obvious, for the sculpture of the Gupta period does not seem due to this inspiration. Neither in outward form nor in character do Vishṇu and Śiva show much more resemblance to Apollo and Mithra than to the Vedic gods. Their exuberant, fantastic shapes, their many heads and arms, are a symbol of their complex and multiple attributes. They are not restricted by the limits of personality but are great polymorphic forces, not to be indicated by the limits of one human shape.[337]
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Though alike in their grandeur and multiplicity, Vishṇu and Śiva are not otherwise similar. In their completely developed forms they represent two ways of looking at the world. The main ideas of the Vaishṇavas are human and emotional. The deity saves and loves: he asks for a worship of love. He appears in human incarnations and is known as well or better by these incarnations than in his original form. But in Śivaism the main current of thought is scientific and philosophic rather than emotional.[338] This statement may seem strange if one thinks of the wild rites and legends connected with Śiva and his spouse. Nevertheless the fundamental conception of Śivaism, the cosmic force which changes and in changing both destroys and reproduces, is strictly scientific and contrasts with the human, pathetic, loving sentiments of Vishnuism. And scandalous as the worship of the generative principle may become, the potency of this impulse in the world scheme cannot be denied. Agreeably to his character of a force rather than an emotion Śiva does not become incarnate[339] as a popular hero and saviour like Râma or Kṛishṇa, but he assumes various supernatural forms for special purposes. Both worships, despite their differences, show characteristics which are common to most phases of Indian religion. Both seek for deliverance from transmigration and are penetrated with a sense of the sorrow inherent in human and animal life: both develop or adopt philosophical doctrines which rise high above the level usually attained by popular beliefs, and both have erotic aspects in which they fall below the standard of morality usually professed by important sects whether in Asia or Europe.