Musar zu Mischlej 29:18

And likewise all of the people are careful about the blood of the soul and the blood of exudate; but some of them are not careful about the preparation of salting, to remove the blood from the meat according to the law. And there are very many like these [examples], without knowledge and without reprimand. And it is like it is stated (Proverbs 29:18), “For lack of vision a people becomes wild.”