બોલે નહીં તે બોળી મારે.

bōlē nahīṁ tē bōḷī mārē.

Literally: The one who does not speak drowns and kills.
What it means: Quiet and secretive individuals are often treacherous and dangerous.
The English proverb Shah set beside it: Silent men and still waters are deep and dangerous.Beware of a silent dog and still waters.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.