Salt is good; but if the salt have lost his saltness - its power to season what it is brought into contact with.
wherewith will ye season it? - How is this property to be restored? See on Mat 5:13.
Have salt in yourselves - See to it that ye retain in yourselves those precious qualities that will make you a blessing to one another, and to all around you.
and - with respect to the miserable strife out of which all this discourse has sprung, in one concluding word.
have peace one with another - This is repeated in 1Th 5:13.