Why Is Death A Part Of Life?
 

What is your theory about it?

Man is spirit, spirit in a physical body. We don't 'die' just transmute into another state of being.

The various 'existences' are necessary for experience, and through this experience - to varying degrees, depending on our ability to grasp the opportunity - we grow in wisdom, love and understanding, which ultimately is the reason for the cycle of life.

passing through a doorway from one location into another is very
similar to death. my experience of "the hallway" dies when i have entered
"the kitchen". focus on the kitchen location would be diminished if i
retained awareness of the hallway.
death is just a transition.
passing from sleep into wakefulness is another death/transition.

cessation of being is not really an option...
even science indicates that this is so, since a principle of physics
is that energy (including matter) cannot be created nor destroyed,
but only transformed in it's expression of being.

Death is a part of life for the same reason why change is a part of life. Furthermore, whatever has a beginning has and ending, and human life has a beginning and thus it has and ending. If human life were eternal when would it begin, because those things which are eternal have no beginning or ending. That which has a beginning always has an ending; this is the premise behind the normal curve; things come into existence, they rise and then they fall. This is true of insects and the smallest of creatures as well as stars and planets. If no one ever died this planet would be incredibly overcrowded. Another similar question might be "why do we have to sleep?" I mean if at our core we are conscious awareness then we are awake/conscious/aware all the time, but why does the body have to sleep? I would guess for the same reason why the human body has to die.

You three have summed it up quite nicely...
I concur.

Death is pert of the circle of life

The spirit must take a body and go through the corcle of karma.. life and death and then be reborn to pay for what he had done.. once he become aware of the inner consciousness and connect to it, he seeks for the ultimate knowledge.. and then he is free from the cycle of births and deaths... it is a part of the lifecycle of a soul.

I think the question is why does spirit pass through physical life. The best answer I came across was that this virtual physical reality has certain rule sets that help us learn and evolve faster.

"Why is death a part of life?"

The way I see it death is a transformation. Transformation in many different forms is continually happening to us and to everything which surrounds us.

Some other ways of framing/conceptualizing physical 'death' -

"Death is a natural transition of consciousness - a continuation of life." - William Buhlman

"A fantastic journey, an awe-inspiring adventure in consciousness" - Stanislav Grof M.D.