Cracked Pipkins
. Cracked pipkins are discovered by their sound. Ignorance is betrayed by speech.
“They bid you talk—my honest song
    Bids you for ever hold your tongue:
    Silence with some is wisdom most profound—
    Cracked pipkins are discovered by the sound.”
 
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	      Entry taken from
	      Dictionary of Phrase and Fable,
	      edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.