Matthew 5:13

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

Augustine of Hippo

AD 430
Hence there follows most justly the statement, You are the salt of the earth; showing that those parties are to be judged insipid, who, either in the eager pursuit after abundance of earthly blessings, or through the dread of want, lose the eternal things which can neither be given nor taken away by men. But if the salt have lost its savour, wherewith shall it be salted? i.e., If you, by means of whom the nations in a measure are to be preserved [from corruption], through the dread of temporal persecutions shall lose the kingdom of heaven, where will be the men through whom error may be removed from you, since God has chosen you, in order that through you He might remove the error of others? Hence the savourless salt is good for nothing, but to be cast out, and trodden under foot of men. It is not therefore he who suffers persecution, but he who is rendered savourless by the fear of persecution, that is trodden under foot of men. For it is only one who is undermost that can be trodden under foot; but he is not undermost, who, however many things he may suffer in his body on the earth, yet has his heart fixed in heaven.
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Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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