They are next door neighbors,three doors down the cerebral corridor.In order to find one you have to experience the other.
i don't really believe in opposites or lines between intangible entities -- there's no good/bad, right/wrong, insane/enlightened... it's all just floating out there together as part of some bigger whole -- so no two things are ever too very far apart at any given time
I'd say that it depends on the type of insanity. For instance if you are insane and in your insanity you slaughter hundreds of people, then I really doubt that that is anything like being enlightened. And if you are enlightened then other people might think you are insane, but in reality you are the only person who is sane. So I guess that I don't think that they are that close. I think that what some people think is insanity isn't really in fact insanity.
Insanity and enlightenment is a difference between illogical and logical thinking. I don't think the two are as closely related as some would like you to think.
After reading this thread I could only think of The Maniac. The following number of posts are chapter two of Chesterton's Orthodoxy (the greatest defense of Christianity ever written). I got the e-text from http://www.conservativeforum.org/EssaysForm.asp?ID=13046 Don't worry about the apology, just sit down with a glass of wine or grape juice and a joint and enjoy this selection from one of the greatest writers of all time.
all i know is that all the really smart people i know are miserable, and all the stupid ones are really happy. i'd rather be stupid.