Matthew Henry Presbyterian @wholebiblehenry

Note, 1. We speak wisely when we speak seasonably: The answer of the mouth will be our credit and joy when it is pertinent and to the purpose, and is spoken in due season, when it is needed and will be regarded, and, as we say, hits the joint. Many a good word comes short of doing the good it might have done, for want of being well-timed.

John Gill Reformed Baptist @doctorgill

A man hath joy by the answer of his mouth,.... When his advice is asked, and he gives good and wholesome counsel, and that being taken succeeds; it is a pleasure to a man that he is capable of assisting his friend, and doing him service, or a common good, whether it be in things natural, civil, or religious; when his speech is with salt...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Good advice blesses the giver and receiver.