Quote: The best [subject would be], “Calamity is a man’s true touchstone."

NO! No no no! You've obviously never spent any time studying your spam messages, because that subject, right there, looks exactly like spam! Bayesian filters are something we use to spot spam emails. It roughly involves looking at word distribution and frequency, or something like that. It's all very exciting. Anyway, spammers try (unsuccessfully) to defeat bayesian filters by quoting random blocks of old books and poetry in the subject and body. I think if you started doing this yourself you might lose 20% or so of your emails to spam filters.

Actually, that might not be a bad thing, those 20% are probably just dead wood anyway. And maybe spam filters are far more clever these days -- I last looked in to this stuff about 8 years ago (and decided that it was too tricky for me, so I left it to cleverer people, like Google and SpamAssassin, who obviously know what they're doing). I don't know, maybe it'd work just fine :)