镞砺括羽

Explanation: Metaphors were hard temper, seek sophistication. Zu grind, sharpen the arrows; including feather, feather dress with the arrow tail. 　　Source: Language of the "Analects of Confucius, Zi has shown signs of" Zi said, 'Shan bamboo, not soft from the straight, cut and use it, up in the rhino leather. To remark it, learn what's there? 'Confucius said,' including the feathers of, arrowheads and grind it, it does not wholeheartedly into the peace? '" 　　Examples: Then there is the road - experience sharing, saints that weight. ★ Tangliu Zong Yuan "to send beans Lu Ying scholar South to order."