Disingenuous

When you select quotes to illustrate your point, it's because you think either (a) people will more easily or readily accept your point from someone 'higher' up in authority than you, or (b) someone else said it better - more eloquently or more concisely or more memorably - than you could.

So, sorry, Pope Benedict XVI - I'm not buying it when you say you "had absolutely no intention" of presenting Manuel II Palaeologus's words as reflecting your own ideas. If you hadn't, you wouldn't have used them in the first place.