Ordinary experience cycles through three recognisable states: waking, in which the senses engage an external world; dreaming, in which the mind generates its own internal world without external sensory input; and deep, dreamless sleep, in which even that internal activity ceases. The Mandukya Upanishad names a fourth, turiya, literally the fourth, and immediately complicates the list by insisting that turiya is not a state alongside the other three in the same sense at all.
A state, by definition, comes and goes; waking gives way to sleep, sleep gives way to dreaming, each replacing the last. Turiya is described instead as the constant background awareness present through all three ordinary states, never itself replaced by any of them, the witness by which the coming and going of waking, dreaming, and deep sleep is itself known to have occurred. It is not a fourth experience added to the list. It is what makes the first three countable as experiences at all, closely related to the witnessing capacity identified through drig drishya viveka earlier in this series.
This is why turiya cannot be described positively the way waking or dreaming can be described, each with characteristic content, sensory engagement for one, internally generated imagery for the other. Turiya has no distinguishing content of its own to point to, since anything it could be described as would immediately become one more object appearing before it rather than the awareness itself. The Upanishad’s own treatment of it proceeds almost entirely by negation, denying it any of the qualities that would make it comparable to the other three states.
The claim that turiya is always present, underlying even deep sleep, raises an immediate and old philosophical problem: if awareness never actually switches off, what is actually going on in dreamless sleep, a state in which, by every ordinary account, nothing is being consciously experienced at all? That apparent contradiction is the specific puzzle this series turns to next.
Part 18 of 100 — Series II: To the Eternal
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