What is our gospel?

OK: I've asked before and I'll surely ask again, but what is the "saving gospel" that I hear some Unitarian Universalists talk about? You know: the one "the world needs to hear."

There's something rather Rorschach test-like about it, in that the discussion of a gospel is in relation to the desirability for one. Still, I trust that it exists, but I'm not so sure that there's a consensus of what it may be. Or perhaps, even more likely, there are multiple gospels and vagueness is our way of holding them together. (I know what I believe as a Christian, and it's not belief or a Unitarian Universalist version of the gospel that keeps me attracted.)

So what is it, or are they? I'm not asking for anything prescriptive, merely some detail that would help me distinguish Unitarian Universalism from cultural endowments of goodwill, self-esteem or beauty.