The lips of the righteous know what is acceptable
To God and man; what is well pleasing to, God, and what ministers grace to the hearers, or what is grateful: and such things they will deliver out; they are used and accustomed to them; not only the righteous know in their judgment what is acceptable, but they use themselves to say those things; they not only know them in theory, but practise them: some men know what is acceptable, but their lips do not know it; they are not used to it, but the contrary; but the mouth of the wicked [speaketh] frowardness;
or perverse things, as before. Or, "the mouth of the wicked [knoweth] frowardness" F2; or perverse things; or is used only to speak froward things; things contrary to truth and righteousness, and which they know to be so; their mouth speaks things contrary to their hearts; their hearts and mouths do not agree, when they both flatter and lie.
The Brenton translation of the Septuagint is in the public domain.