The eyes of the LORD preserve knowledge, and he overthroweth the words of the transgressor.
The eyes of the Lord preserve knowledge - namely, that of the godly, practical, and experimental knowledge of the truth. His "eyes," regard with favour, so that He 'preserves' those who have saving "knowledge" of Himself. He takes care that it shall not be lost to them. "Pureness of heart" is the avenue to it, and brings with it the friendship of the great King (Proverbs 22:11.)
And he overthroweth the words of the transgressor. They hoped by lies and flatteries to gain friends; but God thwarts and overthrows them and their words.