Ye are the salt, etc.. Weiss thinks that St. Luke gives it in its original context; that St. Matthew is right in interpreting it as of special reference to the disciples; and that St. Mark applies it the most freely.
It may, indeed, be that its position here is only the result of the inspired guidance of the evangelist; but, on the whole, it seems more probable that so natural a figure was used more than once by our Lord, and that he really spoke these words in his sermon on the mount, as well as on the later occasion indicated by St.
Luke. Ye; i.e. the μαθηταί of verse 1. Are, in fact ( ἐστέ); therefore recognize the responsibility. The salt of the earth. It has been disputed whether allusion is here made to the preservative properties of salt or to the flavour it imparts; i.
e. whether Christ is thinking of his disciples as preserving the world from decay, or as giving it a good flavour to the Divine taste. Surely a useless question; forgetful of the fact that spiritual realities are being dealt with, and that it is therefore impossible for the one effect to be really separated from the other.
Our Lord is thinking of the moral tone which his disciples are to give to humanity. The connexion with verses 11, 12 is—Persecution must be borne unless you are to lose your moral tone, which is to be to the earth what salt is to its surroundings, preserving from corruption and fitting for (in your case Divine) appreciation.
What χάρις is to be to the Christian λόγος (Colossians 4:6), that the Christian himself is to be to the world. If … have lost its savour ( μωρανθῇ); so elsewhere in Luke 14:34 only. Salt that has lost its distinctive qualities is here said to lack its proper mind or sense.
Salt without sharpness is like an ἄνθρωπος ἄλογος; for man is a ζῶον λογικόν. On the fact of salt losing its virtue, cf. Thomson, "It is a well-known fact that the salt of this country [i.e. Palestine] when in contact with the ground, or exposed to rain and sun, does become insipid and useless.
From the manner in which it is gathered [vide infra], much earth and other impurities are necessarily collected with it. Not a little of it is so impure that it cannot be used at all; and such salt soon effloresces and turns to dust—not to fruitful soil, however.
It is not only good for nothing itself, but it actually destroys all fertility wherever it is thrown.… No man will allow it to be thrown on to his field, and the only place for it is the street; and there it is cast, to be trodden under foot of men."
It should be observed that the salt used in Palestine is not manufactured by boiling clean salt water, nor quarried from mines, but is obtained from marshes along the seashore, as in Cyprus, or from salt lakes in the interior, which dry up in summer, as the one in the desert north of Palmyra, and the great Lake of Jebbul, south-east of Aleppo.
Further, rock-salt is found in abundance at the south end of the Dead Sea (cf. Thomson, loc. cit). Wherewith shall it be salted? i.e. not if you will not act as salt, wherewith shall the earth be salted?
(apparently Luther and Erasmus); but what quality can take the place of moral tone to produce in you the same result? You are as salt. If you lose your distinctive qualities, where, can you find that which answers to them?
It is thenceforth good for nothing. Our Lord here lays stress, not on want of fitness ( εὔθετον, Luke), but on want of inherent power. "It is only useful for that purpose to which one applies what is absolutely useless" (Weiss-Meyer).