Books
Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding.
— Proverbs 17:28 ‧ The Bible

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Silence can disguise ignorance. The proverb observes that even a foolish person who keeps quiet is taken for wise, and someone who closes their lips is credited with understanding. Restraint in speech creates an impression of intelligence, whether or not any thought lies behind it.
Context reviewed