汉代著名学者刘向在《说苑.建本篇》讲了这样一个故事:晋平公问于师旷曰:“吾年七十,欲学,恐已暮矣。”师旷曰:“何不炳烛乎?”平公曰:“安有为人臣而戏其君乎?”师旷曰:“盲臣安敢戏其君?臣闻之:少而好学,如曰出之阳;壮而好学,如曰中之光;老而好学,如炳烛之明,孰与昧行乎?”平公曰:“善哉!” Liu Xiang, a famous scholar in the Han Dynasty, told such a story: Jin Ping asked the teacher Kuang said: “I am seventy, want to learn, fear has been late.” Teacher Kuang said: “Why not Bing Ping? ” Flat public said: “An as a minister and play the king?” Master Kuang said: “blind minister An dare to play their monarch? The yang; Zhuang and studious, as said in the light; old and studious, such as the candle Ming, what and ignorance almost? ”Flat public saying: "