Les eaux stagnantes sont mangeuses d’hommes (Proverbe Luba – République Démocratique du Congo (RDC), Zambie, Angola). Méfiez-vous des gens qui ne disent rien.
Stagnant waters are man eaters (Luba proverb – Democratic Republic of Congo (DRC), Zambia, Angola). Beware of people who do not say anything.
African Heritage 
That is a macabre, yet very useful proverb. The imagery really shows how dangerous people can be when they’re silent.
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