In fact everything is based of energy. This energy vibrates at different levels and with greater and lesser intensity. We are energy, our human world is energy, all the possessions we own are energy. We as pure energy cannot exist in this earthly world because here energy is transformed into matter and we need a body to survive and allow us to interact with all this world has to offer.
What we know as human death is only a transition. We leave our earthly body consisting of matter and move onward.
We do not cease to be, we do not stop. We evolve.
Although those left behind have to deal with the loss of a loved one, it is only in the physical sense. For the departed loved one still exists but has returned to an energy form. They are still there for us and just thinking of them brings them close to us. They interact with our world more often in the early years but as time passes for us here on earth it also passes for them, albeit in a different way. They continue on their journey and continue learning and growing as spiritual beings, but they will forever be there when we need them. We are all reunited when we pass on and continue our journey in energy form.