THE BHAGAVAD GITA
Here is a small excerpt from the introduction to Easwaran’s translation which refers to the various states of consciousness.
“The Upanishads delineate three ordinary states of consciousness: waking, dreaming and dreamless sleep. Each is real, but each has a higher order of reality. For beyond these three, the Upanishads say, is the unitive state, called simply ‘the fourth’: turiya. Entering this state is similar to waking up out of a dream sleep: the individual passes from a lower level of reality to a higher one.
The sages called the dream of waking life - the dream of separate, merely physical existence - by a suggestive name, maya. In general use the word meant a kind of magic, the power of a god or sorcerer to make a thing appear to be something else. In the Gita, maya becomes the creative power of the Godhead, the primal creative energy that makes unity appear as the world of innumerable separate things with name and form.”
When I learnt of these states of consciousness I realised how they symbolically mapped onto the design of the tabernacle that we read about in the book of Exodus. It is these close connections between the ancient texts that lead me to believe they have all grown out of the same ground of reality.