12 those who are pure in their own eyes and yet are not cleansed of their filth;

Read Proverbs 30:12 Using Other Translations

There is a generation that are pure in their own eyes, and yet is not washed from their filthiness.
There are those who are clean in their own eyes but are not washed of their filth.
They are pure in their own eyes, but they are filthy and unwashed.