Buta-ni Shinju (豚に真珠)
Buta (豚・ブタ): a pig; a hog; swine
Shinju (真珠・しんじゅ): pearls
Don’t throw/cast pearls before swine.
Give nothing precious to those who don’t understand its value.
“Neko-ni Koban” (equivalent to “Buta-ni Shinju”): Neko – Cats; Koban – Gold
No mercy on those who never appreciate whatever given.