[Don't throw] pearls before swine. Based on the verse found in the Bible; Matthew 7:6 in which it is written: "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" [tear you into pieces].

A caution against offering the uncultured anything of quality; or, a caution against presenting anything to those who have no appreciation for the value of the product that has been created.