This is a fantastic poem called Realize, author unknown. I first saw it hanging as a poster in my then girlfriend's room. This poem captured both the essence of time in the viewpoint of different people in their unique circumstances. Take this as the sequel of my previous post "Time slipping through my hands like sand".
Realize
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To realize the value of one year, ask a student who has failed a final exam.
To realize the value of one month, ask a mother who has given birth to a premature baby.
To realize the value of one week, ask an editor of a weekly newspaper.
To realize the value of one hour, ask the lovers who are waiting to meet.
To realize the value of one minute; ask a person who has missed the train, bus or plane.
To realize the value of one second, ask a ......