I is the self sustaining thought which dominates the host. It manifests at a young age through conditioning of thought. It gives rise to itself through thought and self sustains through thought. It gives its host the thought that it exists as an entity because of the dense-ness it projects from all the snowballed thoughts, beliefs and concepts put together.
What were we before birth when no thought pervaded the body? Nothing, There was nothing there in existence.
What are we after death with thoughts no longer have their self preserving container to feed them. Nothing, there is still nothing there.
Death and Birth are the same, two sides of the same coin, if there is no pain to be felt at birth, there is no reason to fear death as death is the same feeling, which is nothing. You were not born and you will not die.
You are what comes before the I thought, pure and vast, a void of emptiness full of everything. You will persist after the bodies death, pure and vast, a void of emptiness full of everything.