The doubt in eternalness and the dread of oblivion is a dull type of fear which resides in the back the minds of so many of us alive today. It is a fear which most of us don't face until we are knocking on the door of our own death or are grieving the death of a loved one. When we have not faced death and the reality of it is upon us, we often do not know what to think of it and so, we fall into depression and deep grief. We become absorbed in illusion. The illusion we become absorbed in is the illusion of seeing death as our own annihilation; we also see it as the permanent loss of others. Sometimes this grief becomes so strong in us that we even let the death of others become our own death as well despite the fact that we are still living.
Our fear of death makes us miss the ever present truth that our existence is not restricted to the single lifespan stretching from the moment we are born to the moment we draw our last breath. There is in fact no such thing as beginning, just as there is no such thing as end. Ultimately there is no coming and there is no going. This physical life is simply a temporary expression of the eternal transcendental energy and consciousness that is you. When the conditions are right for it, that energy manifests into a life and when conditions are no longer right, it withdrawals its flow through that manifestation. It is an eternal cycle which takes place again and again. You can not have a life and you can not lose a life because you are life.
Though your eyes and ears may no longer perceive the presence of a singular expression which we call a life, it does not mean it isn't there. You can not lose the interconnectedness that is the basis of all that is. Your body is much like a radio sitting on a nightstand. The radio is the expression through which radio waves manifest themselves. The radio waves (which represent your real, eternal self) still exist there after the radio is gone. They are still all around you. They simply no longer have a physical radio to manifest themselves through. There is no such thing as extinction. You do not lose yourself in death. You do not lose others in death. They are all around you, like radio waves accessible at any moment.
Death is nothing more than a withdrawal of consciousness. And though our limited senses do not make it seem so, the loved ones who have experienced a physical death are closer to you in death than they even were in life. Because for them, there is no distance, space or time. Give yourself permission to be where you are, even if that is currently a space of grief, then gradually when you feel as if you are ready and wanting relief, search within yourself. Reach for the recognition of what you have always intuitively known, that there is no death, and therefore there is no such thing as genuine loss. If you do this, you will find a space of living without fear. You will know peace, you will touch immortality, and you will not know the sorrow of death anymore.