When you were born they rejoiced while you cried, be the one to rejoice when they cry over your death.

Life is short. That is not disputed by anyone but how we make use of our short presence in this world is what matters. Do we spend the short time making fun as we're told "make fun coz life is short" or will we spend the short time fulfilling our true purpose in life. and what is our true purpose in life? Allah says "'I have not created men and jinn except to worship Me". Allah also tells us in another verse "Did you think that We had created you in play (without any purpose), and that you would not be brought back to Us" All other activities are geared towards achieving this one life purpose.  create wealth so that you can give it away in charity, study and become a scholar so that you can teach others and spread knowledge of deen, marry and raise a family so that you can bring up a pious family that will be useful to the ummah. 

Life is a preparation for the hereafter. How best you prepare will determine whether you will rejoice when others are crying because of your death. It will determine whether we will be saying I wish i was given one more chance and crying as other cry.
Remembering death is one sure way to do good deeds. It will prevent us from heedlessness and disobedience. It will prevent us from wasting the little time we have a round.it will help us in fulfilling our true purpose in life.
Below is a short description of that moment by Sheikh Ash-shinqitee:
Before that day and before that immense scene must come a moment in which a person is taken from the place of illusion and deception (Dunya) to either a place of punishment (hell) or to a place of pleasure (jannah), a moment of moments in which the slave is ordained to be relocated from this life, that is the moment in which a person casts his final glances upon his sons and daughters and upon his brothers and sisters, casting final glances upon this world, the signs of the pangs of death clearly evident on his face and there emerge from deep him the sighs and moans of dying. indeed it is a moment in which even the disbeliever believes in and even the wicked evildoer has full surety of it. It is a moment in which a person recognizes the true lowly insignificance of this world, it is the moment in which a person truly feels he has neglected and disobeyed his lord, indeed it is the moment in which a person feels the deepest regret and pain for every single moment he neglected and disobeyed Allah, He calls out "My lord! My lord! send me back so that i do righteous in that which i have left behind, its the final decisive moment which even took the prophet SAW, its that which a person exclaims I wish I knew, Will I be called to paradise or to hellfire, will it be said "oh you righteous , assured, satisfied soul come back to your lord pleased and Him pleased with you or will it be said oh you filthy evil soul come out to the punishment of your lord and His anger"

Do we ask ourselves how our ending will be?