Give a general idea in your own words.

During the Spring and Autumn Period, there was a man named Sun Yang, who was called Bole and was good at watching horses. Bole's son memorized the Book of Watching Horses written by his father by experience, thinking that he also had the ability to know horses. One day, Bole's son saw a toad on the side of the road. He remembers the book saying that a good horse is a horse with a bulging forehead, bright eyes and four big hooves. He thought, "This guy has a bulging forehead and big bright eyes. Isn't it a swift horse? " So he went to his father (Bole) and said, "I found a horse (a swift horse), and all other conditions met, except that the hoof was not big enough!" Knowing that his son was stupid, Bole smiled angrily and said, "Matthew you found loves to jump, so you can't ride!" " "