What Does "Salt" Mean in Matthew 5:13?

Light or Persecution?

Brian Davidson over at LXXI blogged about Matthew 5:13

In light of verses 11-12, perhaps we are to read “of the earth” as a genitive of possession or a “genitive which expresses relations merely external” (Robertson, Grammar of the Greek New Testament, p 234). That is, in the eyes of the world, disciples of Jesus still belong to the world. Yet, disciples, people who resemble the beatitudes of verses 3-12, have “lost their salt.” They no longer fit it. They’ve become “foolish” (μωρανθῇ). They are good for nothing but trampling (καταπατεῖσθαι), and should expect to be “cast out” (βληθὲν ἔξω).

Read the rest here.