Cast pearls before swine to give or offer something valuable t | Desvl English Tips

Cast pearls before swine
to give or offer something valuable to someone who does not understand its value
出自圣经：
“Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.”
— Matthew 7:6 (KJV)
其中，swine是pig的同义词。