When we morn for someone who has gone, are we really mourning for them, or for ourselves, those who are left behind. The dead may be able to hear us, but they cannot answer back when we call, no matter how hard they try to be heard or how hard we try to hear. Those gone may also be in a better place, but we are not. We still have pain and sorrow, and perhaps even anger and regret. Those feelings can do nothing to change the past, but they can change the future.
Some say that the past is gone and cannot change the present. This is not completely true. The past may be gone, but its influence is still here. We need to learn to live with what the past has brought, and try to make the future the best we can using the present before the present becomes the past and we can no longer change it.