Proverbs 26:7 - Joseph Benson’s Commentary on the Old and New Testaments

The legs of the lame are not equal Hebrew, דליו, are lifted up, namely, in going, which is done with great inequality and uncomeliness; so is a parable in the mouth of fools No less absurd and indecent are wise and pious speeches from a foolish and ungodly man, whose actions grossly contradict them, whereby he makes them contemptible, and himself ridiculous.