This proverb has come true for them: “The dog has returned to its own vomit, and the washed pig has gone back to rolling in the mud.”
Stupid people repeat their stupidity like a dog returning to its vomit.
If the mold returns and affects the house again even after the stones have been removed and the house has been scraped and replastered,
When Jesus gave this illustration those who were listening to him didn't understand what he meant.