Got to fulfill the book

All knowledge is contained in a small space
between two boards or else between two ears;
pages foxed with time, hairs grey with years.
A double-folded letter serves to mark the place
where we stopped reading, where the simple grace
of honest laughter served to end the tears
drawn by the saddest tale, where all our fears
were instantly dispelled by one embrace.
The story's swiftly told, it's one we know
and have for years retold within our hearts,
but what is heard rings different on each ear.
The book will close, our times will have to go,
each of us knows that we have played our parts,
the last page will be stained by a single tear.