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.