"To realize..."

To realize the value of ONE YEAR, ask a student who failed a grade.
To realize the value of ONE MONTH, ask a mother who gave birth to a premature baby.
To realize the value of ONE WEEK, ask the editor of a weekly newspaper.
To realize the value of ONE DAY, ask a bride the day before her wedding.
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 a train.
To realize the value of ONE SECOND, ask a person who just avoided an accident.
To realize the value of ONE MILLISECOND, ask the person who won a silver medal in the Olympics.

Treasure every moment you have.

Yesterday is history.
Tomorrow is a mystery.
Today is a gift, that's why it's called the present.