They are an example of that true saying, The dog has gone back to the food it had put out, and the pig which had been washed to its rolling in the dirty earth.
Like a dog going back to the food which he has not been able to keep down, is the foolish man doing his foolish acts over again.
And if the disease comes out again in the house after he has taken out the stones and after the walls have been rubbed and the new paste put on,
In this Jesus was teaching them in the form of a story: but what he said was not clear to them.