A basket of grinding inkstones

In ancient times, there was a man who studied calligraphy. He thought he had learned it, so he said goodbye to Master. Master said, "I have a box of things that I don't want to give to others. I hope to put it under a mountain. " The man took it, because the seal of the thing was not tightly sealed, so he opened it and found dozens of inkstones with holes in it, only to know that it was used by Master before. I felt ashamed at once, so I went back to study until I became proficient in calligraphy.