To realize...

To realize
The value of a sister/brother:
Ask someone
Who doesn't have one.

To realize 
The value of a friend or family member:
Ask someone who has lost 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 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 minute:
Ask a person
Who has missed the train, bus or plane.

To realize
The value of one second:
Ask a person
Who has survived an accident.

Time waits for no one.

Treasure every moment you have.

(The origin of this letter is unknown)