What's the source for the quotation of the form "Let ___ Be ___"?

Question

I keep seeing this used in various places -- this morning on a Google News headline as "Let McCain Be McCain", a couple months ago in a Battlestar Galactica review, "Let Baltar Be Baltar" and in a couple of other places. But there's no good way to search for this on a quotation site. Does anyone know where this comes from?

Answer 1

One of the earliest usages (in print) of this form must be

LET bygones BE bygones- "Forget the past and don't hold a grudge. The saying has been traced back to Robert Pitscottie's "Chronicles of Scotland" (1577):

Answer 2

I don't know. I'm still trying to figure out where. "State of the Art" came from.