Salt is good: but if the salt have lost his saltness, wherewith will ye season it? Have salt in yourselves, and have peace one with another. If the salt have lost his saltness - See on Matthew 5:13 (note).
Have salt in yourselves - See that ye have at all times the preserving principle of Divine grace in your hearts, and give that proof of it which will satisfy your own minds, and convince or silence the world: live in brotherly kindness and peace with each other: thus shall all men see that you are free from ambition, (see Mark 9:34), and that you are my disciples indeed. That it is possible for the salt to lose its savor, and yet retain its appearance in the most perfect manner, see proved on the note on Matthew 5:13 (note).
Commentary on the Bible, by Adam Clarke [1831].