To realize the value of a sister, ask someone who doesn't have one. To realize the value of ten years, ask a newly divorced couple. To realize the value of four years, ask a graduate. To realize the value of one year, ask a student who has failed a final exam. To realize the value of nine months, ask a mother who gave birth to a still born. To realize the value of one month, ask a mother who has 给 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 爱人 who are waiting to meet. To realize the value of one minute, ask a person who has missed the train, bus 或者 plane. To realize the value of one-second, ask a person who has survived an accident. To realize the value of one millisecond, ask the person who has won a silver medal in the Olympics. To realize the value of a friend, lose one.

Moral: Don't take everything for granted.