Solomon
Proverbs 16:21BSB·traditional attribution
The wise in heart are called discerning, and pleasant speech promotes instruction.
Matthew Henry Presbyterian
Note, 1. Those that have solid wisdom will have the credit of it; it will gain them reputation, and they shall be called prudent grave men, and a deference will be paid to their judgment. Do that which is wise and good and thou shalt have the praise of the same. 2.
Jamieson-Fausset-Brown Reformed
wise in heart--who rightly consider duty. sweetness of the lips--eloquent discourse, persuades and instructs others.
Geneva Bible Notes Reformed
The wise in heart shall be called prudent: and the sweetness of the lips increaseth learning. (k) The sweet words of consolation which come from a godly heart.