The prophet Jeremiah, as he often does--and not without reason, has been complaining. God has told him things are going to get worse (15:13-14).
Jeremiah complains again, "I've said what you've told me to say, and I have suffered for it. Why won't you stop this pain?"
God offers reassurance to Jeremiah. "Keep saying what I want you to say. Your enemies will not win, for I am with you. I'm the one who can and who will save you."
Does Jeremiah fear that God has deserted him, or does he fear that God won't leave him alone?