Bīnbīn-yǒulǐ de tàidù gěi rén liúxià hǎo yìnxiàng.
A courteous attitude leaves a good impression.
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history
From the Analects of Confucius: 文质彬彬,然后君子 - when refinement (文) and substance (质) are well balanced (彬彬), then one is a gentleman. 彬彬 originally meant 'balanced and harmonious' and came to mean 'elegant and refined'.