经一事，长一智

Explanation: Personally experienced something, you can increase the knowledge in this regard 　　Usage: Complex sentence; as subject, adverbial, clause; that experienced long-knowledge can 　　Source: "New Five words of Historical Chinese history": "People have often said: 'it was a subordinate state bidders, who, having learned a lesson'." 　　Examples: However, '~', has passed a quarter of the twentieth century. ★ Lu Xun "metaphor a little canopy set Sequel" Thesaurus:  Not in the pit, to be wise, chiyiqian, changyizhi