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During the Spring and Autumn period, after being marginalized in the political scene of the State of Lu, Confucius led his disciples on a journey across various states. They received little recognition in places like Wey and Song.
On their way to the State of Jin, Zilu advised Confucius against seeking patronage from a petty man like Zhao Yang.
However, Confucius, believing himself to be a junzi (a noble person), declared that he would be 'ground but not thin, dyed but not black' (磨而不磷,涅而不缁), signifying his unwavering integrity and refusal to compromise his noble character, thus preserving his reputation.

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Open the tool →不磷不缁 (bù lín bù zī) is a Chinese idiom (chengyu) meaning “Unaltered by external forces, maintaining one's purity and integrity”.
不磷不缁 is pronounced bù lín bù zī in Mandarin Chinese.
Literally, 不磷不缁 means “not ground thin, not dyed black”. It is used to mean “Unaltered by external forces, maintaining one's purity and integrity”.
不磷不缁 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
磨不薄,染不黑。比喻坚贞高洁的品质,不因外界影响而有所改变。