THE EYE OF THE NEEDLE. This phrase is commonly misinterpreted as impossibility. The "eye of the needle" referred to the low, narrow, easily defended portal left open at night in city fortifications. A camel could indeed pass through the "eye of the needle", but with great difficulty, shuffling on it's knees. Horses don't do that, so hostile cavelry was pretty much excluded. This was by design.
Turns out that's not quite true, at least according to [link|http://www.wnetc.com/scripture-l/Footnotes/Footnotes2.html|this]...
In fact, if the author is to be believed, it was an attempt by the clergy to hold onto that upper crust that you talk about them losing...
I was about to post the same thing in this thread, and did a google search on it. That's what came up.