Introduction
The Vedanta philosophy, as it is generally called at the present day, really comprises all the various sects that now exist in India. Thus there have been various interpretations, and to my mind they have been progressive, beginning with the dualistic or Dvaita and ending with the non-dualistic or Advaita. The word Vedanta literally means the end of the Vedas — the Vedas being the scriptures of the Hindus.
Sometimes in the West by the Vedas are meant only the hymns and rituals of the Vedas. But at the present time these parts have almost gone out of use, and usually by the word Vedas in India, the Vedanta is meant.
All our commentators, when they want to quote a passage from the scriptures, as a rule, quote from the Vedanta, which has another technical name with the commentators — the Shrutis. (The term Shruti — meaning “that which is heard” — though including the whole of the Vedic literature, is chiefly applied by the commentators to the Upanishads.)
Now, all the books known by the name of the Vedanta were not entirely written after the ritualistic portions of the Vedas. For instance, one of them — the Ishâ Upanishad — forms the fortieth chapter of the Yajur-Veda, that being one of the oldest parts of the Vedas.
There are other Upanishads which form portions of the Brahmanas or ritualistic writings; and the rest of the Upanishads are independent, not comprised in any of the Brahmanas or other parts of the Vedas; but there is no reason to suppose that they were entirely independent of other parts, for, as we well know, many of these have been lost entirely and many of the Brahmanas have become extinct. So it is quite possible that the independent Upanishads belonged to some Brahmanas, which in course of time fell into disuse, while the Upanishads remained. These Upanishads are also called Forest Books or Aranyakas.