If I didn't have as high an opinion of the author as I did, I'd think he meant Harry because Quirrell's cynical, mostly-accurate view is somehow immoral. Actually, I think it could be either Quirrell or Harry: Quirrell because he has a more detailed and largely correct model, Harry because he recognizes that whatever the cause of the Wizengamot's lack of ambition, it has to do with them being insane to the point of inability to achieve/imagine greatness, not purely because they have no great desires. That is, the Wizengamot wizards' problem isn't purely a result of lame terminal values. I'm probably not explaining this very clearly, and I apologize, but what it comes down to is that I think EY meant Harry is the most wise, and there are arguments for him actually being so, but Quirrell is either wiser or a close second. Also note that Quirrell is supposed to have a lot in common with Robin Hanson on the subject of most people's psychology.