Memento Mori: the most important thing in the world

One day you'll look up at the ceiling above
 If you're lucky you'll be surrounded by the ones that you love when
 The lights in your eyes fade and life flashes by
 One day you're going to die
 One day you'll sleep and you'll never wake again
 Heaven, hell, Nirvana, nothing, no one knows how it ends
 Rest in peace or pieces and won't even know why
 One day you're going to die
 Read your horoscopes, your palms and tarot cards
 But either way your destination ain't very far
 You could drown, or choke, or burn, or be hit by a car
 What doesn't kill you makes you stronger
 But something will eventually
 One day you'll look back at the life that you led
 No more future left to fear that you'll have the past to regret
 But your worries will be over if you truly realize
 One day you're going to die
 Take it away, hands
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 In the fabric of time and in the vastness of space
 A billion amounts to nothing in infinity's face
 At most a couple generations will remember the ways in which
 Your life never mattered
 So, who cares if it's a waste?
 Well, one day you'll be not even a faint memory, no
 At most a ghost or falling leaf from your family tree
 Your legacy's not yours to see, nor is your eulogy
 And you'll never know what it all means
 But you'll be at peace before you sleep if you just keep this in mind
 That everything and everyone goes with the passage of time
 So whether it's cancer, murder, or suicide
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 One day you're going to die
 No need to fear 'cause when it's here you won't be alive
 Try not to think about it
 One day you're going to die
 And there's probably nothing after
 One day you're going to die
 So if you only have one chance
 You oughta try your best to live as you like
 One day you're going to die