Hindu texts the Vedas to be "apauruṣeya", which means "not of a man, superhuman" and "impersonal, authorless". The knowledge in the Vedas is believed in Hinduism to be eternal, uncreated, neither authored by human nor by divine source, but seen, heard and transmitted by sages. Vedas are also called ' ("what is heard") literature, distinguishing them from other religious texts, which are called ' ("what is remembered"). The Veda, for orthodox Indian theologians, are considered revelations, some way or other the work of the Deity. In the Hindu Epic the Mahabharata, the creation of Vedas is credited to Brahma. There are four
Vedas be studied in a forest, while the other holds that the name came from these being the manuals of allegorical interpretation of sacrifices, for those in Vanaprastha (retired, forest-dwelling) stage of their life, according to the historic age-based Ashrama system of human life. The Upanishads reflect the last composed layer of texts in the Vedas. They are commonly referred to as "Vedānta", variously interpreted to mean either the "last chapters, parts of the Vedas" or "the object, the highest purpose of the Veda". The concepts of Brahman (Ultimate Reality) and Ātman (Soul, Self) are central ideas in all the Upanishads,