That fact that it's even at the risk of being published on the public web should be enough to disqualify it as a passphrase for everyone.
I've had users use parts of lesser known poems or stories in some foreign language, because who would expect that, right? Turns out that's not what's relevant to a good password but rather whether it is in any available corpus.
If your passphrase consists of something likely to be in wikipedia you are guaranteed to get owned in minutes.
