Agni also springs from the aërial waters, and is often said to have been brought from heaven. Born on earth, in air, in heaven, Agni is frequently regarded as having a triple character. The gods made him threefold, his births are three, and he has three abodes or dwellings. "From heaven first Agni was born, the second time from us (i.e. men), thirdly in the waters." This earliest Indian trinity is important as the basis of much of the mystical speculation of the Vedic age. It was probably the prototype not only of the later Rigvedic triad, Sun, Wind, Fire, spoken of as distributed in the three worlds, but also of the triad Sun, Indra, Fire, which, though not Rigvedic, is still ancient. It is most likely also the historical progenitor of the later Hindu trinity of Brahma, Vishnu, Çiva. This triad of fires may have suggested and would explain the division of a single sacrificial fire into the three which form an essential feature of the cult of the Brahmanas. Owing to the multiplicity of terrestrial fires, Agni is also said to have many births; for he abides in every family, house, or dwelling. Kindled in many spots, he is but one; scattered in many places, he is one and the same king. Other fires are attached to him as branches to a tree. He assumes various divine forms, and has many names; but in him are comprehended all the gods, whom he surrounds as a felly the spokes. Thus we find the speculations about Agni's various forms leading to the monotheistic notion of a unity pervading the many manifestations of the divine. Agni is an immortal who has taken up his abode among mortals; he is constantly called a "guest" in human dwellings; and is the only god to whom the frequent epithet grihapati, "lord of the house," is applied. As the conductor of sacrifice, Agni is repeatedly called both a "messenger" who moves between heaven and earth and a priest. He is indeed the great priest, just as Indra is the great warrior. Agni is, moreover, a mighty benefactor of his worshippers. With a thousand eyes he watches over the man who offers him oblations; but consumes his worshippers' enemies like dry bushes, and strikes down the malevolent like a tree destroyed by lightning. All blessings issue from him as branches from a tree. All treasures are collected in him, and he opens the door of wealth. He gives rain from heaven and is like a spring in the desert. The boons which he confers are, however, chiefly domestic welfare, offspring, and general prosperity, while Indra for the most part grants victory, booty, power, and glory. Probably the oldest function of fire in regard to its cult is that of burning and dispelling evil spirits and hostile magic. It still survives in the Rigveda from an earlier age, Agni being said to drive away the goblins with his light and receiving the epithet rakshohan, "goblin-slayer." This activity is at any rate more characteristic of Agni than of any other deity, both in the hymns and in the ritual of the Vedas.