Definição e Significado de "still waters run deep"

What is the origin of the proverb "still waters run deep" and when to use it?

The origin of the proverb "still waters run deep" can be traced back to ancient times, with variations appearing in both Greek and Latin literature. The proverb suggests that those who are less outspoken or do not seek attention often have more to offer beneath the surface. It serves as a reminder not to judge others based on their outward behavior, as true depth and understanding are often hidden beneath a calm or quiet exterior.