Once we are old enough (and mature enough) to understand the finality of death, we begin to consider the concept of remembrance. Early on, we know that our family and close friends will remember us and, over time, come to understand that we are remembered by others for our unique skills, our personal traits and our impact on society as a whole.
As adults, factors such as celebrity and creativity may significantly increase one's exposure in human society, thereby augmenting the remembrance that they receive. Of course, this may be a positive or negative remembrance.
Living on in the memories of others is the secular person's afterlife and knowing that their influence has been both personal and societal offers reassurance as death looms. Unfortunately, those who conclude that their life has been meaningless and/or unappreciated too often resort to violent acts as they bow out, ensuring that they will be remembered in the annals of history.
Addendum: This post has been altered from the original.