Modern thinkers generally hold that the earliest literature of India is the Vedas, of which Rg Veda was the first to be composed. These were hymns in praise of nature gods, which emphasised ritualism and had little philosophic content. Some have even attempted statistical analysis of the number of times individual god names were taken up for praise and concluded that Vishnu , later extolled as the Supreme God, has fewer hymns than the more common Indra, Agni and Varuna. Subsequent compositions called braahmaNa-s and araNyaka-s both in verse and prose contain attempts in explaining philosophical and cosmological questions. Upanishads were composed next in order and contain the highest flights of philosophical speculation in Vedantic thought. While perhaps it is comforting to reduce the entire source material of Vedanta philosophy into a well ordered scheme which the modern mind can easily understand, there are serious discrepancies in this theory. Vedantins who profess the Vedic streams of all hues have traditionally believed that the Vedas and Vedanta literature is apaurushheya, not composed by anyone (including God) and hence beginning less and eternal. Even the name used for the Vedas for thousands of years of human memory -- Shruti indicates this fact, which is also justified by rigorous logic. Far from being a collection of disjointed hymns, which the Vedas are made out to be by people ignorant of them, there is in them a thread of unity of thought, in describing a Supreme Being, who is different and who is the inner controller of all other beings , including the so called nature gods. The artificial division of the mass of Vedic literature into karma kaaNDa (dealing with rituals) and j~nAna kANDa dealing with Philosophy is untenable, in the context of the three fold interpretation of the Vedas, explained for the first time by Sri Madhva, in his Rgbhashya.

According to Madhva, the Brahma Suutra's OM gatisAmAnyAt.h OM clearly indicates the decided position of its author, Veda Vyaasa, that all the Vedas, believed to be infinite in extent, have eka-vaakyata unity in stating the conclusion. Be as that as may, the ten principal Upanishads contain the essence of the philsophical teaching of the entire Vedic religion. The Brahma Suutra, composed by Veda Vyaasa, accepted as the authority for the correct interpretation of the Vedas refers to a number of well known Upanishadic texts and gives clues regarding their correct and consistent interpretation. All the different founders of Vedanta schools have started from the basic position of the infallibility of the Vedas, Upanishads and the Brahma Sutra and have tried to justify the claims that their own conclusions are in accordance with them.