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.

People's New Testament

9:50 Have salt in yourselves. The spirit of self-sacrifice, and thus you will have peace with one another.

Wesley's Notes

9:50 Such salt is good indeed; highly beneficial to the world, in respect of which I have termed you the salt of the earth. But if the salt which should season others, have lost its own saltness, wherewith will ye season it? - Beware of this; see that ye retain your savour; and as a proof of it, have peace one with another. More largely this obscure text might be paraphrased thus: - As every burnt offering was salted with salt, in order to its being cast into the fire of the altar, so every one who will not part with his hand or eye, shall fall a sacrifice to Divine justice, and be cast into hell fire, which will not consume, but preserve him from a cessation of being. And on the other hand, every one, who, denying himself and taking up his cross, offers up himself as a living sacrifice to God, shall be seasoned with grace, which like salt will make him savoury, and preserve him from destruction for ever. As salt is good for preserving meats, and making them savoury, so it is good that ye be seasoned with grace, for the purifying your hearts and lives, and for spreading the savour of my knowledge, both in your own souls, and wherever ye go. But as salt if it loses its saltness is fit for nothing, so ye, if ye lose your faith and love, are fit for nothing but to be utterly destroyed. See therefore that grace abide in you, and that ye no more contend, Who shall be greatest. Mt 5:13; Lu 14:34.

Jamieson-Fausset-Brown Bible Commentary

50. 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 [1470]Mt 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.

Matthew Henry's Concise Commentary

9:41-50 It is repeatedly said of the wicked, Their worm dieth not, as well as, The fire is never quenched. Doubtless, remorse of conscience and keen self-reflection are this never-dying worm. Surely it is beyond compare better to undergo all possible pain, hardship, and self-denial here, and to be happy for ever hereafter, than to enjoy all kinds of worldly pleasure for a season, and to be miserable for ever. Like the sacrifices, we must be salted with salt; our corrupt affections must be subdued and mortified by the Holy Spirit. Those that have the salt of grace, must show they have a living principle of grace in their hearts, which works out corrupt dispositions in the soul that would offend God, or our own consciences.