Tā jiǎnféi zǒngshì yī pù shí hán, suǒyǐ yìzhí méi xiàoguǒ.
He diets only sporadically, so he never sees results.
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From 《孟子·告子上》: 虽有天下易生之物也，一日暴之，十日寒之，未有能生者也 — 'even the easiest-growing plant will not survive one day of sun and ten of cold.' Mencius's metaphor for inconsistent moral self-cultivation.
mistakes
暴 here is pronounced pù, not bào — it means 'sun-expose' (same as 曝), not 'violent'. The variant 一曝十寒 makes this explicit.
