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
Jerome
AD 420
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.