Indeed, the state of the bliss/absolute non-change is precisely described in Hinduism as a state of nothingness, (and the belief is, this is where you disappear to every night during deep blissful sleep). Yet Brahman is much more than merely nothingness it is everything-ness, and the all-encompassing potential (a difficult concept to contemplate).

May it be likened to death? Well I believe so, in which case we are all saved in our final hour, and eternal bliss and our saviour is a certainty? (Yet it is your state of mind at the point of death that is most important, as it is with the Abrahamic faiths – Atonement or denial? Acceptance or fear? And where does this leave rebirth and reincarnation? – You may well ask, have a think and decide.

Also checkout what Sri Ramana Maharshi says regarding final freedom, (moksha), death, and the enlightened knowledgeable Jnani, who still appears as manifest even when enlightened, both to himself and to others, (Ajnani). The Yogi may find enlightenment in life through self-knowledge, yet only in death does he return to Brahman and escape the cycle of Samsara.

Regarding geometry..

Perhaps this is merely a problem regarding definitions, terms and semantics?

Does the term "dimension" refer to spatial co-ordinates and planes in a singular existence, or to separated and distinct phenomena that we perceive as manifest together, and that which we perceive in connectedness due only to our mind and conscious awareness? Should we use different terms to distinguish and separate what may be inferred to as distinct phenomena from our understandings of spatial co-ordinates?

As I understand, String theory infers the existence of at least ten dimensions, with spatial dimensions, length, breadth, height, (up, down, sideways?) and time described as the first four of these – how can this be? Is this really sensible? How can you reconcile geometry with separated dimensions? - Since all these dimensions are required mutually and do not permit the definition of spatial positioning or the construction of perceived solid objects, (buildings and bridges), without all three together, or with one of these missing? (Notice I did not declare four dimensions here!).

More info regarding String Theory, "The Elegant Universe" here >

http://www.pbs.org/wgbh/nova/elegant/Once again, to reiterate my views regarding time. Time is merely the measurement of rate of change of motion, (of velocity). Without motion and velocity time cannot exist. Yet it is useful for predictions of position and speed whilst change and motion and impermanence are manifest.

It is the "rate of change of motion" which permits the calculation and the prediction of the forthcoming position of say, a planet or a target using mathematical projection of the rate of velocity and the directional change of position, (the mathematical projection of motion). It is NOT the mathematical prediction of this position in a future time! Time is irrelevant to the calculation and the motion and the position, it is the "rate of change" that defines the calculations.

Time cannot exist without change and motion, and "Big bang theory" declares to us that at the singularity time=zero, (time does not yet exist, at the singularity without change in circumstance, without motion).

Regarding your thought experiment. You are correct that each thought must follow a causal sequence from say an emanation to a conclusion, and thus this would occur over a period of time or alternatively as a rate of change, and a neural process, (motion). It would make no difference if you existed as merely thought or mind alone, since even this metaphysical state would still imply motion, and a change of circumstance, (of thoughts and ideas). So until you can completely still the mind and eliminate all motion of thought, time would still exist.