Righteous lips are the delight of kings,.... Such that speak truth and righteousness, and advise to the administration of justice and judgment, and to do that which is most for their own true honour and the people's good, are, or ought to be, highly valued and esteemed by kings: but the contrary is too often the case; kings hearken to those that speak lies, that flatter them, and gratify their pride, ambition, and love of power, to the hurt of their subjects;
and they love him that speaketh right: agreeably to right reason; which makes for the honour of kings, and the good of those over whom they rule. Christ loves and delights in those that deliver out his doctrines in the taught words of the Holy Ghost, without any mixture or corruption; that explain, inculcate, and enforce his laws and commands; and faithfully declare the whole counsel of God, both with respect to faith and practice; all which is for his glory, as King of saints, and to the profit and advantage of those who submit to the sceptre of his kingdom.

Put those in power who know how to speak to the purpose.

A specification of the general sentiment of Proverbs 16:12.

History is full of such warning examples, and therefore this proverb continues to hold up the mirror to princes.
Well-pleasing to kings are righteous lips,
And whoever speaketh uprightly is loved.
Rightly the lxx ἀγαπᾶ, individ. plur., instead of the plur. of genus, מלכים; on the contrary, Jerome and Luther give to the sing. the most general subject (one lives), in which case it must be distinctly said, that that preference of the king for the people who speak out the truth, and just what they think, is shared in by every one. צדק, as the property of the שׂפתי, accords with the Arab. ṣidḳ, truth as the property of the lasân (the tongue or speech). ישׁרים, from ישׁר, means recta, as נגידים, principalia, Proverbs 8:6, and ריקים, inania, Proverbs 12:11. ישׁרים, Daniel 11:10, neut. So neut. וישׁר, Psalm 111:8; but is rather, with Hitzig and Riehm, to be read וישׁר. What the proverb ways cannot be meant of all kings, for even the house of David had murderers of prophets, like Manasseh and Joiakim; but in general it is nevertheless true that noble candour, united with true loyalty and pure love to the king and the people, is with kings more highly prized than mean flattery, seeking only its own advantage, and that, though this (flattery) may for a time prevail, yet, at last, fidelity to duty, and respect for truth, gain the victory.