"Did perpetual happiness in the Garden of Eden maybe get so boring that eating the apple was justified?"

That's the fifth most "liked" quote on the topic of "sin" at goodreads. It's from Chuck Palahniuk, Diary (which is a novel, not a diary). The forth most liked also involves poor old Adam. It's by Mark Twain:

Adam was but human—this explains it all. He did not want the apple for the apple's sake, he wanted it only because it was forbidden. The mistake was in not forbidding the serpent; then he would have eaten the serpent.

But I've heard snake is tough, tougher than dog (and less crunchy than grasshopper).

Sorry for the gratuitous Obama-eats-dog/snake punchline. It was not my motivation to look up quotes. I was actually searching for a quote about boredom, something like the only sin is being boring. Interestingly, the most-liked goodreads quotes on the topic of "boredom" are boring. Seriously, how many ways are there to say If you're bored, it's because you are boring? And now I've lost track of what somebody said that made me what that sin-of-boringness quote, which might not even exist.

“Life is for living and working at. If you find anything or anybody a bore, the fault is in yourself.”
― Elizabeth I

Am I boring you? You must be boring.

IN THE COMMENTS: Sweetbriar and Jody both point me to the answer: Christopher Hitchens, in his memoir, "Hitch-22." Page 13. His mother used to say:  "The one unforgivable sin is to be boring."

And I think what got me looking in the first place was a comment by Patrick over in the "Predictable Althouse Is Predictable" post:

Honestly, when I first came to this blog, back in the day, I assumed that you, a law professor especially at Madison, would be a typical lefty law professor. In fact, I likely put off reading the blog for awhile because I assumed it would be the same old boring lefty stuff. This is a very interesting blog, and your political opinions or votes are part of that, but really, there's a lot more to it. Vote for Ron Paul for all I care, or Dennis Kucinich. Just don't be boring about it!