A man goes to see a doctor, and the doctor asks him what's wrong - he bends his elbow and tells her, "It hurts when I do that." So the doctor says to him, "Then don't do that."
Jeremiah says what God told him to say, and he's getting persecuted for doing it. So why doesn’t Jeremiah quit doing it?
Jeremiah responds to God's call because he loves God. He also loves the people God sent him to, and finds that if he doesn't speak up, "it becomes like a fire burning in my heart...I grow weary holding it in, I cannot endure it." Jeremiah is stuck, no wonder he feels "duped." But he could be the only warning they get, so he can't hold it in.
Even if they don’t want to hear it? Especially if they don’t want to hear it.
More on how this and Tuesday's post relate to Sunday's Gospel tomorrow.