cast pearls before swine
to offer something valuable to someone who does not understand that it is valuable

[TahlilGaran] Dictionary of Contemporary English ▲

cast pearls before swine
[literary]
to offer something valuable to someone who does not understand that it is valuable.
Giving him advice is just casting pearls before swine. He doesn't listen.

[TahlilGaran] English Idioms Dictionary ▲

cast pearls before swine
to waste something valuable on someone who does not appreciate it; to waste something on someone who will not be thankful or care about it
Giving the woman the gold earrings was like casting pearls before swine.

Giving the jewellery to the woman will be casting pearls before swine. She will not appreciate it at all.

[TahlilGaran] English Idioms Dictionary ▲

cast pearls before swine
n. phr., literary To waste good acts or valuable things on someone who won't understand or be thankful for them, just as pigs won't appreciate pearls.
■ Often used in negative sentences.
I won't waste good advice on John any more because he never listens to it. I won't cast pearls before swine.

[TahlilGaran] English Idioms Dictionary ▲

cast one's pearls before swine
{n. phr.}, {literary} To waste good acts or valuable things on someone who won't understand or be thankful for them, just as pigs won't appreciate pearls. - Often used in negative sentences.
I won't waste good advice on John any more because he never listens to it. I won't cast pearls before swine.

[TahlilGaran] English Idioms Dictionary ▲