The next line of the quote is "The dead are not alive, and the living will not die.

Short answer, because I have to go is - heaven is an illusion because you make your own heaven or hell right here on earth. The soul never dies - Reincarnation - there is NO death - hence the "living" never die... The dead are not alive - because they did not "live". The soul in energy and energy cannot be destroyed - there is no beginning or end. Energy transforms - it's ever changing - again, reincarnation. Energy can dissipate -- as seen by - changing of auras or the dimming of our light or when the light goes out when the physical body dies or even when someone is very ill. We're ALL energy and some souls shine brighter than others.

Yes, heaven is energy and consciousness - awareness. Perhaps when the soul leaves the body - maybe it merges with the white light of "God".

This is what I think the verse means and may not reflect what I actually believe - jury is still out....

For me it means that nothing in our physical world ever stays still, everything is in delicate equilibrium ... whether we realize it or not, every fraction of a second things change, within ourselves and all around ... it is the continuous movement of creation, and once we recognize and acknowledge this flow within us we can begin to control it.

have fun :)

possibly it is an analogy to what is to be,
that the heavens and the earth go through cycles
of being there in material forms and not so,

not sure of what it is when said
'the heaven as we imagine it to be'.
are we all but dreamers
or seekers to turn over every rock

for our answer