You are the salt of the earth: but if the salt has lost its savor, how shall it be salted? it is thereafter good for nothing, but to be cast out, and to be trodden under foot of men.
All Commentaries on Matthew 5:13 Go To Matthew 5
Chromatius of Aquileia
AD 407
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 of unbelievers. And so Jesus says, “But if the salt loses its flavor, with what will it be seasoned?” For people of this sort, made tasteless by the devil’s treachery and having lost the grace of faith, are good for nothing. Though they once might have seasoned nonbelievers still foreign to the faith with the word of divine preaching, they instead showed themselves useless. Judas Iscariot deteriorated into this sort of useless salt. After he had rejected divine wisdom, having changed from an apostle into an apostate, he not only did not help others. He became wretched and useless even to himself. .