Within what, exactly? If there's a within, what and where is the barrier or boundary that separates it from without? How does one reconcile that separation with a cosmic/unity consciousness?
And remember if we are always observing through the filter of our thoughts then we are changing the thing being observed - just like in quantum physics "act of observing affected what is observed".
I don't know what that is.
> The first layer of "within" can be easily understood. In between 2 successive thoughts is a state of "no thoughts".
That doesn't match my experience at all. There are times when I don't pay attention to my thoughts, or my thoughts aren't distinct enough to grasp, but that's not an absence of thought. For me, the concept of "between 2 successive thoughts" makes about as much sense as "between two drops of water in a river".
The only way I can relate your description to anything I understand is to suspect that what you're describing is shifting your attention away from your thoughts to interoceptive sensations, and then reifying your integration/synthesis of those sensations into a distinct entity rather than a representation of your body. But maybe I just haven't read enough Deepak Chopra to "get it".
a) attachment (constant association of our attention to anything) to impermanence of life, b) regrets and guilt.
If the mourner itself was truly liberated while living then they wouldn't be depressed because they would know from experience that death is nothing but a switch to a different dimension for consciousness to operate in. That dimension is far less limiting than this physical dimension. And the way to that dimension (and higher ones) is only through Meditation and natural death, the latter comes as a shock to the unrealized one and then its too late for any preparedness.
-- C. W. LEADBEATER, Man Visible and Invisible
Edit: for people who flagged the parent comment, this is an interesting read http://lesswrong.com/lw/mm/the_fallacy_of_gray/
Hidden underneath the quest for immortality is the eternal quest of freedom from all known and unknown bounds. Unfortunately enough, this quest, when expressed from the confines of the apparatus called "mind" shows up as ego which is limiting, self serving and divisive. To experience the real singularity and immortality one needs an instrument which at its very core is limitless and that my friend is "consciousness". The reason current scientists have not been able to understand the limitless and eternal nature of consciousness is their fundamental assumption which is "matter gives rise to consciousness". Unless this assumption is turned around to "consciousness gives rise to matter" until then this quest for immortality will remain just that, a quest and never a realized goal.
At an individual level, we don't have to wait for the Ray's or Singularity of the world, this quest can be completed by each and everyone of us, by focusing our attention within. Attention is the expression of our consciousness in our physical being, and by focusing it within we can break free from the limitations of our 5 senses and the endless maze of thoughts. It is at point of liberation we will realize that we are all immortal beings who where focused in the limited dimensions created by the illusory mind and are all interconnected by the inherent Singularity of cosmic/unity consciousness.
Meditation or focusing within is the first step towards a successful quest of Singularity and Immortality.