You are the salt of the earth: but if the salt have lost his flavor, with which shall it be salted? it is thereafter good for nothing…
The Latin Church, m its materialistic fashion, employs actual salt in the baptismal service. The priest puts it into the mouth of the person, adult or infant, who is baptized. It is an unauthorized ceremony; but it is a sort of traditional witness to the obligation lying on all Christians to have in themselves that which salt might symbolize.
(Dr. D. Fraser.)
Parallel VersesKJV: Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men.