[Lukongsimi]

do not cast pearls before swine" advises against sharing something valuable with those who won't appreciate or understand its worth, essentially wasting it on an unappreciative audience. It's a metaphor using the image of pigs trampling valuable pearls, according to some interpretations. The focus is on the recipient's lack of appreciation, not their inherent worth, according to this YouTube video. 

The phrase originates from the Sermon on the Mount in the Bible, where Jesus uses it to caution his followers against sharing sacred teachingswith those who would reject or disrespect them.It's not a blanket prohibition against sharing, but rather an encouragement to be discerning about where and to whom one offers valuable things.