遊刃有餘

From Zhuangzi:

彼節者有間，而刀刃者無厚；以無厚入有間，恢恢乎其於遊刃必有餘地矣，是以十九年而刀刃若新發於硎。 [Classical Chinese, trad.]

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彼节者有间，而刀刃者无厚；以无厚入有间，恢恢乎其于游刃必有余地矣，是以十九年而刀刃若新发于硎。 [Classical Chinese, simp.]

From: Zhuangzi, circa 3^rd – 2^nd centuries BCE

Bǐ jié zhě yǒu jiān, ér dāorèn zhě wú hòu; yǐ wú hòu rù yǒu jiān, huīhuī hū qí yú yóu rèn bì yǒu yúdì yǐ, shìyǐ shíjiǔ nián ér dāorèn ruò xīn fā yú xíng. [Pinyin]

(please add an English translation of this example)

遊刃有餘

1. to handle a butcher's cleaver skillfully; to do a task with skills and ease; to achieve something effortlessly