The value of time can never be overstated. How can we know the value of time?

If you want to know the value of one year, ask the student who has lost it.
If you want to know the value of one month, ask the mother who had a premature baby.
If you want to know the value of one week, ask the publisher of a weekly newspaper.
If you want to know the value of one day, ask the day laborer who has earned meals everyday for his family.
If you want to know the value of one hour, ask the lover when he waits for his loved one.
If you want to know the value of one minute, ask the traveler who has missed his flight.
If you want to know the value of one second, ask the gold medalist.