Yes, salt is good; but, if the salt itself should lose its strength, what shall be used to season it?
It is you who are the Salt of the earth; but, if the salt should lose its strength, what will you use to restore its saltiness? It is no longer good for anything, but is thrown away, and trampled underfoot.
Let your conversation always be kindly, and seasoned, as it were, with salt; that you may know in each case what answer you ought to give.