The only free cheese is in the mouse trap. — English proverbs

A proverb or an adage is a simple, traditional saying that expresses a perceived truth based on common sense or experience. Proverbs are often metaphorical and are an example of formulaic language. A proverbial phrase or a proverbial expression is a type of a conventional saying similar to proverbs and transmitted by oral tradition. The difference is that a proverb is a fixed expression, while a p