First thing's first. . .

Hope you enjoy the little devil up above.

I know that it's been a long time since I last posted, but I've been having a "devil" of a time figuring out how to blog Inferno. Then I realized that I never asked you this simple question. I'd like you to post your answer, with explanation and examples, in the comments by 10pm Sunday.

What, exactly, is "sin"?