This idiom suggests that one should never judge a person solely by their outward appearance, as their true character, abilities, or depth of potential might be far greater than what is superficially visible. It implies that inner qualities are more significant than external looks.
Era:
Ancient
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Story:
In ancient times, there was an oil seller named Qin Zhong who fell deeply in love with a renowned courtesan, Hua Kui Niangzi. He was utterly devoted to her. Hua Kui also developed a strong affection for him.
To gather the ten taels of silver required for a single night's lodging with her, Qin Zhong painstakingly saved and scrimped every penny. Even the clerk at the silver shop, witnessing his dedication and efforts, was moved to exclaim, "Indeed, one cannot judge a person by their appearance, just as the vastness of the sea cannot be measured by a mere dipper!"
Later, Hua Kui managed to escape the hardships of the brothel and married Qin Zhong. The couple lived a long and loving life together.