What do you mean by casting pearls before swine?

It means bright pearls, secretly thrown on the road, which makes people surprise. Metaphorically speaking, talented people are not valued. It is also a metaphor that good things fall into the hands of people who don't know the goods.

"Playing the lute to a cow" is an idiom derived from the works of literati, which originated from Historical Records, Biographies of Lv Zhonglian and Biographies of Zou Yang by Sima Qian in Han Dynasty. ?

Casting beads behind the scenes is a bright pearl. Casting beads behind the scenes on the road is surprising. Metaphorically speaking, talented people are not valued. It is also a metaphor that good things fall into the hands of people who don't know the goods. Generally, it is used as predicate, object and attribute in sentences.

Idiom implication

No matter how talented a person is, he will not be appreciated if he doesn't meet someone who cherishes his talent. Loyalty and no flattery are Zou Yang's virtues and noble qualities, but at some point, they become accusations.

This shows how important it is for a good minister to meet a wise gentleman. Playing the lute to a cow is not only unappreciated or reused, but also may bring disaster. On the contrary, if strongly recommended, mediocrity will appear superior. This is exactly what people should ponder.