The conception of the sacrifice set forth in the Brâhmaṇas is that it is a scientific method of acquiring immortality as well as temporal blessings. Though originally a mere offering in the _do ut des_ principle, it has assumed a higher and more mysterious position[158]. We are told that the gods obtained immortality and heaven by sacrifice, that they created the universe by sacrifice, that Prajâpati, the creator, _is_ the sacrifice. Although some writers are disposed to distinguish magic sharply from religion, the two are not separated in the Vedas. Sacrifice is not merely a means of pleasing the gods: it is a system of authorized magic or sacred science controlling all worlds, if properly understood. It is a mysterious cosmic force like electricity which can be utilized by a properly trained priest but is dangerous in unskilful hands, for the rites, if wrongly performed, bring disaster or even death on bunglers. Though the Vedic sacrifices fell more and more out of general use, this notion of the power of rites and formulae did not fade with them but has deeply infected modern Hinduism and even Buddhism, in both of which the lore of spells and gestures assumes monstrous proportions. The Vedic and modern tantric rituals are different but they are based on the same supposition that the universe (including the gods which are part of it) is regulated by some permeating principle, and that this principle can be apprehended by sacred science and controlled by the use of proper methods[159]. So far as these systems express the idea that the human mind can grasp the universe by knowledge, they offer an example of the bold sweep of the Hindu intellect, but the methods prescribed are often fatuous. The belief in the potency of words and formulae, though amplified and embellished by the Hindus, is not an Indian invention but a common aspect of early thought which was less emphasized in other countries. It is found in Persia and among the tribes of Central and Northern Asia and of Northern Europe, and attained a high development in Finland where _runot_ or magical songs are credited with very practical efficacy. Thus the Kalevala relates how Wäinämöinen was building a boat by means of songs when the process came to a sudden stop because he had forgotten three words. This is exactly the sort of thing that might happen in the legends of a Vedic sacrifice if the priest had forgotten the texts he ought to recite.