Educators say that books are the key to wisdom, historians say that books are the ladder of progress, writers say that books are the nourishment of human beings, economists say that books are the information to get rich, strugglers say that books are the guide of life, explorers say that books are the ships to the other side, learners say that books are a "good meal" when they are hungry, and students say that books are silent teachers.

This is a metaphor in the book. Comparing books to different things has different functions in every field, occupation and other fields. Similarly, the educator storytelling is the carrier of preaching and teaching, the historian storytelling is the reference of what is known and lost, the student storytelling is the way to acquire knowledge, and the writer storytelling is the painstaking effort of emotional cohesion.