“Do not give dogs what is sacred; do not throw your pearls to pigs. If you do, they may trample them under their feet, and turn and tear you to pieces.”
I always thought that verse meant not to share your sacred thoughts, feelings, and beliefs with people who would mock the words, then deride you for having had those thoughts, beliefs, and feelings. I used to hear it used that way a lot. I also find it to be wise advice not to share one’s precious thoughts with just anyone lest they judge me in ignorance or malice.