Matthew Poole and continuators on Proverbs 13:15

15. Good understanding giveth favour , but the way of transgressors is hard .

Discovering itself by a mans holy and righteous practices and ways, as appears from the opposition of the way of transgressors to it, and as words of Understanding in this and other Books of Scripture commonly include practice.

Maketh a man acceptable both to God and men.

The carriage or manner of conversation.

Or, rough, as this very word is used, Deut. 21. 4. offensive and hateful to God and Men, as rough ways are to a Traveller, fierce, and intractable, and incorrigible.