This is the great change to which the Brahmanas bear witness. They show no marked departure from the theology of the Vedas, though many of the old gods continue to be dethroned either to disappear altogether, or to reappear in new shapes, like Varuna, who turns into a god of night to be worshipped no longer for his beneficence, but to be placated for his cruelty; whilst, on the other hand, Prajapati is raised to the highest throne, with Sun, Air, and Fire in close attendance. What the Brahmanas do show is that the Brahman has acquired the overwhelming authority of a sacerdotal status, not vested merely in the learning of a theologian, but in some special attribute of his blood, and therefore transmissible only from father to son. The Brahman was doubtless helped to this fateful pre-eminence by the modifications which the popular tongue had undergone in the course of time, and as the result more especially of migration from the Punjab to the Gangetic plains. The language of the Vedic hymns had ceased to be understood by the masses, and its interpretation became the monopoly of learned families; and this monopoly, like all others, was used by those who enjoyed it for their own aggrandisement. The language that had passed out of common usage acquired an added sanctity. It became a sacred language, and sacred became the Brahman, who alone possessed the key to it, who alone could recite its sacred texts and perform the rites which they prescribed, and select the prayers which could best meet every distinct and separate emergency in the life of man.
In the Brahmanas we can follow the growth of a luxuriant theology for the use of the masses which, in so far as it was polytheistic, tended to the infinite multiplication of gods and goddesses and godlings of all types, and in so far as it was pantheistic invested not only men, but beasts and insects and rivers and fountains and trees and stones with some living particle of the divine essence pervading all things; and we can follow there also the erection on the basis of that theology, of a formidable ritual of which the exclusive exercise and the material benefits were the appanage of the Brahman. But we have to turn to a later collection of writings known as the Upanishads for our knowledge of the more abstract speculations out of which Hindu thinkers, not always of the Brahmanical caste, were concurrently evolving the esoteric systems of philosophy