When you listen to a parable, you should be thinking, “Somebody in this parable is me. And somebody in this parable is God.” So the disciples are listening in, saying, “Okay, we have to be the needy old widow, right? Right. But that would make God … woah, wait a minute. You’re saying that God is like a grumpy old judge who doesn’t care—about people or about justice—and only gives this woman what she wants because she’s annoying him?”
Who else but Jesus could get away with that analogy?