First and most important thing, when reading Plato you always hear Socrates say again and again that one should "know himself" (http://en.wikipedia.org/wiki/Know_thyself#By_Plato). I don't have any exact citation at hand, you can find the exact links on wikipedia, but this theme seams to permeate all his speeches. Sometimes even if it's not said in plain words you kind of feel that that's what he has been after all along, i.e. a better understanding of oneself.

And there's also Socrate's mistrust regarding books, which isn't directed at the physical objects, but more at what the books represent, condensed wisdom that many of us already take for granted without questioning. In certain ways that's very similar to what the modern educational system does to today's kids, I mean we take lots of things for granted without bothering of thinking with our heads anymore.