Solomon
Proverbs 30:12ESV·traditional attribution

There are those who are clean in their own eyes but are not washed of their filth.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A caution not to abuse other people's servants any more than our own, nor to make mischief between them and their masters, for it is an ill office, invidious, and what will make a man odious, Pro 30:10. Consider, 1.

Commenting on Proverbs 30:10-14

John Gill Reformed Baptist @doctorgill

There is a generation that are pure in their own eyes,.... Not in the eyes of God, who sees the heart, and all the impurities of it, as well as of life and conversation; nor in the eyes of others, though such may appear outwardly righteous before men; but in their own eyes, in their own conceit and imagination, trusting in themselves that they are...

Keil & Delitzsch Lutheran @keilanddelitzsch

Pro 30:11-14 There now follows a Priamel, the first line of which is, by יקלל, connected with the יקללך of the preceding distich: 11 A generation that curseth their father, And doth not bless their mother; 12 A generation pure in their own eyes, And yet not washed from their filthiness; 13 A generation - how haughty their eyes, And their eyelids lift themselves up...

Commenting on Proverbs 30:11-14