The lips of the righteous know what is acceptable: but the mouth of the wicked speaketh frowardness.
The lips of the righteous know what is acceptable. "Know" - i:e., have the power, through the divine teaching of the mind and heart, to speak what is acceptable to God, and even to Man_1:-1 :e., to speak spiritual truth in the moat acceptable form (Ecclesiastes 12:10-11; Malachi 2:7).
But the mouth of the wicked (speaketh) frowardness - not things acceptable to God and man, but only froward things, even as he knows nothing but frowardness.