專心致志

From Mencius (《孟子·告子上》):

今夫弈之為數，小數也；不專心致志，則不得也。弈秋，通國之善弈者也。使弈秋誨二人弈，其一人專心致志，惟弈秋之為聽。一人雖聽之，一心以為有鴻鵠將至，思援弓繳而射之，雖與之俱學，弗若之矣。為是其智弗若與？曰：「非然也。」 [Classical Chinese, trad.]

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今夫弈之为数，小数也；不专心致志，则不得也。弈秋，通国之善弈者也。使弈秋诲二人弈，其一人专心致志，惟弈秋之为听。一人虽听之，一心以为有鸿鹄将至，思援弓缴而射之，虽与之俱学，弗若之矣。为是其智弗若与？曰：「非然也。」 [Classical Chinese, simp.]

From: Mencius, c. 4^th century BCE, translated based on James Legge's version

Jīnfú yì zhī wéi shù, xiǎo shù yě; bù zhuānxīn zhìzhì, zé bùdé yě. Yìqiū, tōngguó zhī shàn yì zhě yě. Shǐ Yìqiū huì èrrén yì, qí yīrén zhuānxīn zhìzhì, wéi Yìqiū zhī wéi tīng. Yīrén suī tīng zhī, yīxīn yǐwèi yǒu hónghú jiāng zhì, sī yuán gōngzhuó ér shè zhī, suī yǔ zhī jù xué, fú ruò zhī yǐ. Wéishì qí zhì fú ruò yú? Yuē: “Fēi rán yě.”

Now chess-playing is but a small art, but without his whole mind being given, and his will bent to it, a man cannot succeed at it. Yi Qiu is the best chess-player in all the kingdom. Suppose he is teaching two men to play. The one gives to the subject his whole mind and bends to it all his will, doing nothing but listening to Yi Qiu. Another one, although he seems to be listening to him, has his whole mind running on a swan which he thinks is approaching, and wishes to bend his bow, adjust the string to the arrow, and shoot it. Although he is learning along with another one, he does not come up to him. Why? Because he isn't as intelligent as another one? Not so.

專心致志

1. to be wholly focused; with single-hearted devotion