Zhǐyào yǒu shéngjù-mùduàn de yìlì, zài nán de shì yě néng zuòchéng.
With the patience of a rope sawing through wood, even the hardest task can be done.
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From the Song collection 《鹤林玉露》: a magistrate punished a clerk caught taking a single coin from the treasury, ruling that a coin a day makes a thousand coins in a thousand days, just as 绳锯木断,水滴石穿. The two halves still usually appear together.