I have designs to do a post every Tuesday called "Quotable Tuesday." What you're reading now is more just a preliminary ("What's past is prologue" a nice quote, right there - and while not especially applicable to this context, it's still nice!) and I hope to have the first honest-to-goodness post of the series up later today.
I'm doing this for two reasons. I like the idea of having a regular "feature." And I really like quotes, or rather, more precisely the stuff of quotes, the lines, phrases, statements that make for good quotes. I often find myself drawn towards pithy, aphoristic writing, think Minima Moralia. And most of my favorite moments in poetry are similar in that way. And while my love of fiction extends beyond just quote-mining, I'm never unhappy to find a great phrase or line that can stand outside of its context. I also enjoy reading writers talking about writing and often there are many good quotes to be had there. And of course, the Bible lends itself marvelously to quotation.
So why quotes? I think that there is great power to be had in the quote. Often we find in a quote a crystallized form of something we felt (and maybe didn't even know we felt). It is there said much more adeptly than we could have. Also, too, the quote, the condensed nature of it, can often cause us to further reflect, perhaps work towards understanding it more deeply, and as such a springboard for good thought they are especially valuable.