Brewer's: Still Waters Run Deep

Silent and quiet conspirators or traitors are most dangerous; barking dogs never bite; the fox barks not when he would steal the lamb.

Smooth runs the water where the brook is deep: And in his simple show he harbours treason. The fox barks not when he would steal the lamb; No, no, my sovereign, Gloucester is a man Unsounded yet, and full of deep deceit.

Shakespeare: 2 Henry VI., III. f.

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