他山之石可以攻玉
tā​shān​zhī​shí​kě​yǐ​gōng​yù

to improve oneself through external help or talent

他山之石可以攻玉 tā​shān​zhī​shí​kě​yǐ​gōng​yù
to improve oneself through external help or talent
literally "the stone from another mountain can polish jade"; an idiom meaning one can improve oneself by accepting advice or criticism from others, or by utilizing external talent and resources to develop one's own organization or nation effectively