"You people are [like] salt on the earth. But if salt loses its flavoring ability, how will it ever get it back again? From then on it would be good for nothing except to be thrown out onto the roadway and walked on by people. [Note: This was mined salt which, when losing its "saltiness" due to exposure to the sun or rain, was simply disposed of by being dumped onto the roadway where people walked].

For I know that nothing good lives in me, that is, in my flesh, for the desire to do good is present in my heart, but the ability to carry it out [consistently] is not.

For they are servants of God for your good. But you should be afraid if you do what is evil, because they do not carry the sword [i.e., for executing criminals] for nothing. For they are servants of God who take revenge [on wrongdoing] by punishing the person who does evil.