Matthew 5:13

He shows that those who have been educated for the faith and in heavenly wisdom ought to remain faithful and steadfast and not "lose their taste." If they forsake the faith and divine wisdom, they either plunge headlong into heresy or return to the folly …

Moreover, salt is changed into another kind of substance by three means, water, the heat of the sun, and the breath of the wind. Thus Apostolical men also were changed into spiritual regeneration by the water of baptism, the heat of love, and the breath of the Holy Spirit. That heavenly wisdom also, which the Apostles preached, dries up the humours of carnal works, removes the foulness and putrefaction of evil conversation, kills the work of lustful thoughts, and also that worm of which it is said their worm dieth not. (Is. 66:24.) The Apostles are the salt of the earth, that is, of worldly men who are called the earth, because they love this earth. It should be known, that in the Old Testament no sacrifice was offered to God unless it were first sprinkled with salt, for none can present an acceptable sacrifice to God without the flavour of heavenly wisdom.

Or, because by the Apostles the whole human race is seasoned. That is, if the doctor have erred, by what other doctor shall he be corrected? The illustration is taken from husbandry. Salt, though it be necessary for seasoning of meats and preserving flesh, has no further use. Indeed we read in Scripture of vanquished cities sown with salt by the victors, that nothing should thenceforth grow there.

A doctor when he is adorned with all the preceding virtues, then is like good salt, and his whole people are salted by seeing and hearing him.

He calls "salt" the frame of mind that is filled with the apostolic word, which is full of understanding. When it has been sown in our souls, it allows the word of wisdom to dwell in us. It has been compared with salt because of salt's good taste and delightfulness. For without salt neither bread nor fish is edible. So too without the apostles' understanding and instruction, every soul is dull and unwholesome and unpleasant to God.

Now then, after giving them due exhortation, He refreshes them again with praises. As thus: the injunctions being high, and far surpassing those in the Old Testament; lest they should be disturbed and confounded, and say, How shall we be able to achieve these things? hear what He saith: Ye are the salt of the earth. Implying, that of absolute necessity He enjoins all this. For not for your own life apart, saith He, but for the whole world, shall your account be. For not to two cities, nor to ten or twenty, nor to a single nation am I sending you, as I sent the prophets; but to earth, and sea, and the whole world; and that in evil case. For by saying, Ye are the salt of the earth, He signified all human nature to have lost its savor, and to be decayed by our sins. For which cause, you see, He requires of them such virtues, as are most necessary and useful for the superintendence of the common sort. For first, the meek, and yielding, and merciful, and righteous, shuts not up his good deeds unto himself only, but also provides that these good fountains should run over for the benefit of others. And he again who is pure in heart, and a peacemaker, and is persecuted for the truth's sake; he again orders his way of life for the common good. Think not then, He saith, that ye are drawn on to ordinary conflicts, or that for some small matters you are to give account. Ye are the salt of the earth. What then? did they restore the decayed? By no means; for neither is it possible to do any good to that which is already spoilt, by sprinkling it with salt. This therefore they did not. But rather, what things had been before restored, and committed to their charge, and freed from that ill savor, these they then salted, maintaining and preserving them in that freshness, which they had received of the Lord. […]

Therefore we must consider that, insofar as each person is able, insofar as he is capable, he should strive to impress upon the Church entrusted to him both the terror of the coming judgment and the sweetness of the kingdom. And he who cannot admonish everyone at once with one and the same voice of exhortation ought to instruct individuals as much as he can, to edify them through private conversations, and to seek fruit in the hearts of his children through simple exhortation. For we must continually weigh what is said to the holy apostles, and through the apostles to us: You are the salt of the earth. If therefore we are salt, we ought to season the minds of the faithful. You then, who are shepherds, consider that you are feeding God's animals. Concerning these animals indeed it is said to God through the Psalmist: Your animals shall dwell in it. And we often see that a block of salt is set before brute animals, so that they may lick that same block of salt and be improved. Therefore, like a block of salt among brute animals, so should the priest be among the people. For the priest must take care what he says to each person, how he admonishes each one, so that whoever is joined to the priest may be seasoned with the taste of eternal life, as if from the touch of salt. For we are not the salt of the earth if we do not season the hearts of our hearers. Indeed, he truly bestows this seasoning upon his neighbor who does not withhold the word of preaching. If therefore the people are the food of God, the priests ought to have been the seasoning of the food. But because while we cease from the practice of prayer and holy instruction, the salt has become tasteless; it cannot season the food of God, and therefore it is not taken up by the Creator, because through our prevailing foolishness it is not seasoned at all.

(ap. Anselm.) When then they who are the heads have fallen away, they are fit for no use but to be cast out from the office of teacher.

Ye are the salt of the earth. The prophets were sent to one race only, but you are the salt of the whole earth. By your teachings and reproofs you act as an astringent upon the slack and the indolent, so that they will not …

Ye - Not the apostles, not ministers only; but all ye who are thus holy, are the salt of the earth - Are to season others.

Ye are the salt of the earth,....

To understand what they have to do--they are to be governed by the moral law. Here is, (1.) A general ratification of the law, and a recommendation of it to us, as our rule,

Ye are the salt of the earth - Salt renders food pleasant and palatable, and preserves from putrefaction. So Christians, by their lives and instructions, are to keep the world from entire moral corruption. By bringing down the blessing of God in answer to their prayers, and by their influence and example, they save the world from universal vice and crime. Salt have lost its savour - That is, if it has become tasteless, or has lost its preserving properties.

The restoration or non-restoration of grace, or true living Christianity, to those who have lost it, has, in our judgment, nothing at all to do here. The question is not, If a man lose his grace, how shall that grace be restored to him? but, Since living Christianity is the only "salt of the earth," if men lose that, what else can supply its place?

These verses teach us, in the first place, the character which true Christians must support and maintain in the world . The Lord Jesus tells us that true Christians are to be in the world “Ye are the salt of the earth.” Now salt has a peculiar taste of its own, utterly unlike anything else. When mingled with other substances it preserves them from corruption; it imparts a portion of its taste to everything it is mixed with. It is useful so long as it preserves its savour, but no longer. Are we true Christians?

These verses teach us, in the first place, the character which true Christians must support and maintain in the world . The Lord Jesus tells us that true Christians are to be in the world “Ye are the salt of the earth.” Now salt has a peculiar taste of its own, utterly unlike anything else. When mingled with other substances it preserves them from corruption; it imparts a portion of its taste to everything it is mixed with. It is useful so long as it preserves its savour, but no longer. Are we true Christians? Then let us see here our office and our duties! The Lord Jesus tells us that true Christians are to be in the world . “Ye are the light of the world.” Now it is the property of light to be utterly distinct from darkness. The least spark in a dark room can be seen at once. Of all things created, light is the most useful: it fertilizes; it guides; it cheers. It was the first thing called into being ( Genesis 1:3 ). Without it the world would be a gloomy blank. Are we true Christians? Then behold again our position and its responsibility! Surely, if words mean anything, we are meant to learn from these two figures that there must be something marked, distinct and peculiar about our character if we are true Christians. It will never do to idle through life, thinking and living like others, if we mean to be owned by Christ as his people. Have we grace? Then it must be seen . Have we the Spirit? Then there must be fruit . Have we any saving religion? Then there must be a difference of habits, tastes and turn of mind, between us and those who think only of the world. It is perfectly clear that true Christianity is something more than being baptized and going to church. “Salt” and “light” evidently imply peculiarity both of heart and life, of faith and practice.

Ye are the salt of the earth - Our Lord shows here what the preachers of the Gospel, and what all who profess to follow him, should be; the salt of the earth, to preserve the world from putrefaction and destruction. See the note on Lev 2:13. But if the salt have lost his savor - That this is possible in the land of Judea, we have proof from Mr. Maundrell, who, describing the Valley of Salt, speaks thus: “Along, on one side of the valley, toward Gibul, there is a small precipice about two men’s lengths, occasioned by the continual taking away of the salt; and, in this, you may see how the veins of it lie. I broke a piece of it, of which that part that was exposed to the rain, sun, and air, though it had the sparks and particles of salt, Yet It Had Perfectly Lost Its Savour: the inner part, which was connected to the rock, retained its savor, as I found by proof.” See his Trav., 5th edit., last page. A preacher, or private Christian, who has lost the life of Christ, and the witness of his Spirit, out of his soul, may be likened to this salt. He may have the sparks and glittering particles of true wisdom, but without its unction or comfort. Only that which is connected with the rock, the soul that is in union with Christ Jesus by the Holy Spirit, can preserve its savor, and be instrumental of good to others. To be trodden underfoot - There was a species of salt in Judea, which was generated at the lake Asphaltites, and hence called bituminous salt, easily rendered vapid, and of no other use but to be spread in a part of the temple, to prevent slipping in wet weather. This is probably what our Lord alludes to in this place. The existence of such a salt, and its application to such a use, Schoettgenius has largely proved in his Horae Hebraicae, vol. i. p. 18, etc.

The call of Jesus Christ means either that we are the salt of the earth, or else we are annihilated; either we follow the call or we are crushed beneath it. There is no question of a second chance.

Is it not only too probable that the mildness of our political satire, when compared with the political satire of our fathers, arises simply from the profound unreality of our current politics? ... If our social relations are more peaceful than those of France or …

And yet, without white, my absurd little pictures would be as pointless as the world would be if there were no good people in it.