Niu Jiao Gua Shu (To Hang Books On The Ox's Horn)
In ancient times, there lived a boy named Li Mi, who loved to read. He never wasted a single minute, but spent all of his spare time every day reading.
One day, Li Mi had to go to a faraway place to take care of some business. Not wanting to waste any time on the way there, he took all of the books that he wanted to read and hung them on one of the horns of his ox. He then climbed up onto his ox's back, and with a book in one hand and the reins in the other, began his journey.
On the way, Li Mi was spotted by Yang Su, a very well-known scholar of the time. Not wishing to interrupt Li Mi while he was so absorbed in his reading, Yang Su instead followed behind the ox, waiting until Li Mi looked up to get a new book. Yang Su then rode up to Li Mi and greeted him, praising him highly for his attitude towards reading.
Today, we can say that a person who is son diligent in his studies that he finds a way to make use of every minute is "Hanging Books On The Ox's Horn."