Proverbs 30:12 Midrash

דּ֭וֹר טָה֣וֹר בְּעֵינָ֑יו וּ֝מִצֹּאָת֗וֹ לֹ֣א רֻחָֽץ׃

There is a generation that are pure in their own eyes, And yet are not washed from their filthiness.

Read midrashic interpretation of Proverbs 30:12: and classical rabbinic exegesis.