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.