Duke Jinping asked Shi Kuang: "I want to learn at the age of seventy, and I'm afraid I'm already dying!" Shi Kuang said, "Why not light candles?" Ping Gong said, "Is it okay for an to be a minister and play with his monarch?" Shi Kuang said, "How dare a blind minister play with his monarch? I heard it: less and eager to learn, like the sun at sunrise; Strong and eager to learn, such as the light of Japan and China; Being old and eager to learn is as bright as a candle. What is the bright light of the candle? " Ping Gong said, "Good!"