cast pearls before swine

From the Bible "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." – KJV, Matthew 7:6.

• "Blanche: ...Physical beauty is passing. A transitory possession. But beauty of the mind and richness of the spirit and tenderness of the heart—and I have all of those things—aren't taken away, but grow! Increase with the years! How strange that I should be called a destitute woman! When I have all of these treasures locked in my heart. [A choked sob comes from her] I think of myself as a very, very rich woman! But I have been foolish—casting my pearls before swine!"

• preach to deaf ears

• caviar to the general
• talk over somebody's head