What does Jeremiah 20:9 mean?

But if I try to keep quiet and not mention him or speak in his name, it feels like a fire burning inside me—deep in my bones. I get tired of holding it in, but I just can't do it. Jeremiah 20:9 - Modern Text Bible

(Jeremiah describes the overwhelming urge to speak God's message, even when he wants to stay silent. The message is like a fire he can't contain.)