How are we eternal?

The best part of the birth of each and every one of We, the conscious humans , is We ourselves have not witnessed our own births.

There is this simple definition for the term "Birth":
"A being can be said to be born only If the process or the activity of birth had been witnessed by another being (the Witness)."
So all We have is since we could witness other's births, We believe that we all also must have also been born on this day called birth day. That witness could be our parents, relatives or just another conscious being.
So essentially We FIT  in to the definition of "being born" just by believing in the words of other conscious people around us and by our direct experience of the birth of others, not the self. So It is the inference arrived later on that I must have been born.
In short, My birth in this world had not been my direct experience just like the way how I prepared this answer was my direct experience, not an inducement of belief or the inference arrived at later.
But the conscious ones who vouch that I was born will not give a clue about where was I before I was born and neither about them where were they before they were born. or Will talk about duality of paradise and hell. Of Creator and created.
Not all, of course.
The sages, the rishis, The Vedas,The Upanishads proclaim that My true nature is unborn, of eternity.
The above definition of birth applies to death too and thus applies to every change that can be perceived in general.
 Thus My true nature is I am the witness consciousness, I am the changeless that keep watching all the changes.
I am the Eternal, beyond time.
I am, the true self, the indweller in my body mind intellect complex, and so  in every other body mind intellect complex.
To simply put : To describe about something, I should be different from that something.

In the same way when I say, I am eternal, "I" means the real "I", Eternal God inside me, the True supreme consciousness.
Shanti Mantra (Mantra of peace) from Brihadaranyaka Upanishad:
Om Asato Maa Sad-Gamaya |
Tamaso Maa Jyotir-Gamaya |
Mrtyor-Maa Amrtam Gamaya |
Om Shaantih Shaantih Shaantih ||
 Om, (O Lord) Keep me not in the Unreality (of the bondage of the Phenomenal World), but lead me towards the Reality (of the Eternal Self),
(O Lord) Keep me not in the Darkness (of Ignorance), but lead me towards the Light (of Spiritual Knowledge),
(O Lord) Keep me not in the (Fear of) Death (due to the bondage of the Mortal World), but lead me towards the Immortality (gained by the Knowledge of the Immortal Self beyond Death),
Om, (May there be) Peace, Peace, Peace.
We are Eternal.
Let's be honest. Unless we are being purely philosophical, humans are in no way eternal.

To say we're eternal because the stuff we're made of is never going to go away-or to come up with unfounded theories that turn time into something where reality doesn't simply occur in sequence-is no more than a clever contrivance asking us to buy into a personal perspective or private definition born more of poetic license than of verifiable facts.

I mean, the same people who insist we are merely the sum of the chemical-electrical events that take place in our brains, and that the rational being doesn't really exist, now insist we all somehow continue to exist-individually-long after the particular arrangement of stuff we were comprised of no longer exists?

By such reasoning, a building in a desert vaporized by an atomic bomb still exists afterwards! But, come on-really?

If that which makes you "you" is what goes on physically in the particular arrangement of stuff that is you-particularly, within your brain-how can "you" still exist after the corporeal "you" has been dissolved or dispersed in cosmic dust-after the chemical-electrical processes have all stopped? When the brain is gone, then, why aren't you gone?

Then, to suggest that all moments in eternity somehow exist at all moments in eternity is simply to put words around the incomprehensible. Who can explain how this can be, without resorting to wild metaphysical machinations?

Reality is manifested in movement! We can't see without movement. We can't feel without movement. We can't smell without movement. We can't even subsist without movement.  For reality to occur, everything in reality must move.

If all reality for all eternity already exists, reality can't move! Nothing can happen-because it has nowhere to happen!

Now, I would love for someone to contend with that, especially on the grounds no established knowledge or laws of reality says it's true-that the whole concept is axiomatic or is incomprehensible to them. Because that's exactly what I contend regarding this idea it does not all happen in sequence-when that's how we all experience reality.

Nothing we know by science, then, tells us we are eternal.

Of course, some will claim their religion says we are eternal. And, with all religions that don't claim the holy scriptures as their source, I do not contend. But, when someone claims the scriptures show we are eternal, there I cannot hold my peace.

Not that I will strive with anyone over it. But, I will state separately-here, in my own answer-that the scriptures plainly show that humans are not eternal-that is, not immortal. And, rather than expound my own reasoning to anyone, I will just provide the scriptural references by which one who cares what the scriptures say can begin to investigate it for themselves (and perhaps a link or two to sources for further self-study).

Scripture References:

On immortality: Romans 2:7; 1 Corinthians 15:53-54; 1 Timothy 6:16; Matthew 10:28; Ezekiel 18:4, 20; Psalm 146:4; Obadiah 1:16; Romans 6:23)

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Whatever material makes our body is eternal. Some twenty years ago I wrote : I was the sky, I was the sea, I was the wind and I was the tree, this is why I know that I will always be.
Since ten years I have worked on a simple form of telepathy, person to person, by which I conclude that  when we meet somebody new, the  feeling remains forever in us, as it does in the other person. So that we are connected by the thousands, and create a sort of Noosphere that causes phenomenon like scientific discoveries at the same time in different places, musical creations, that  some musician can catch. Those strange phenomenon give us the impression of the Divine. This is just a fleeing thought. I will elaborate my theory on another occasion.
I keep in my mind  a convenient feeling  that still makes of me a believer in a personal God that is above earth, above the  Noosphere, in the infinity of the Cosmos.( Noosphere like internet, but without the computers, in my vision is in the air, above us. It is formed by the power of our brains that contain our memories and our parents, parents memories. What is needed is a connection that one day somebody will make). Michel Di Sclafani
To answer this question, first I'd like to believe that you need a scientific explanation. Recall that over 100 years back, Albert Einstein was presented noble prize for his relativity theory which postulates that there's been conversion happening between mass and energy (E = mc2). We existed before we were born, perhaps switching between energy and mass several times and there's nothing stopping it. Thus, we will continue to survive even after our death!  However, it is noteworthy that the concept of eternity is not limited to our 70 years of human life, rather it is a broader concept. Our existence will never stop as no energy is ever escaping the universe.
I doubt we are. I suggest that our awareness of our existence depends on the present arrangement of the molecules etc in our bodies. However, the 'idea' of ourselves could continue as long as there existed some representation of ourselves, even if there were no-one there to experience that representation. Think of a titanium bust of yourself, floating alone through deep space, having survived whatever cataclysm might befall Earth.
Because The One Who created us told us so. Death is the beginning of the eternal life. Either Eternal Paradise or Eternal Hellfire - based on our beliefs and actions. This life is just a test. Read the first few verses here, it's a message to YOU from YOUR Creator:
The Noble Qur'an - القرآن الكريم
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