lit. if you tap a half-empty bottle it makes a sound (idiom) / fig. empty vessels make the most noise / one who has a little knowledge likes to show off, but one who is truly knowledgeable is modest
those who understand others are clever, but those who know themselves are truly wise (idiom, from Laozi's 道德經|道德经[Dao4 de2 jing1]
The four tones
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