Death gives a reason to our lives. More important then that, death creates a special value for time. If our time on earth was undetermined, life on its own wouldn't make any sense and probably we would still be living without clothes and with a spear on hand. Death is the most powerful agent in nature, it comes to take away the old and make space for the new. Our effort to avoid it and make our short stay here something slightly memorable is what motivates us. Life only exists because of death.
