Surprise ! Surprise !
All the humans know that ,- by every moment they are approaching towards their death , but they are never bothered to rethink of it !!! In Mahabharata , - Yudhisthira was asked what are the three most surprising things in the world . Yudishtira answered all the questions right ,- one amongst them was like the above , - that the humans approaching towards death by every moment are not at all scared , hence bothered of death .
All have some wish & will to fulfill before their demise and they work towards it . But,- since nobody is aware when the moment is going to draw its 'final curtain' , nobody could actually visualize out a proper project of this work or the design of his final ambition . The entire workout on ambition becomes a stream of a river without knowing where the ocean is going to start or end .
It could also be brought into simile of the condition of unending sky which doesn't know it's limit .
As a matter of fact , - man is never aware whether he is actually going to come to a halt ,- or start a new life afresh when his death physically comes .
It is often estimated that he is going to start a new life ,- hence his last dying words are often treated as his words that indicate starting a new & fresh life across his death .
Looking into such confusing options ,- man only takes his life more seriously than his approaching days of 'black curtain' to his earthly life .
The only case where 'the last dying words' are of concern to man is , - when they are told & materialise to match the future experience to earthly life .
These become famous quotes from the people who are later marked as prophets .