to realize.............

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 gave birth to a premature baby

to realize the value of one week:

ask an editor of 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 person who has survived an accident

to realize the value of one millisecond:

ask the person who has won a silver medal in Olympics

to realize the value of a friend:

lose one

to realize the value of a relationship:

be faithful, you are not gonna realize it when you are alone. :P