You may enjoy thiss conversation from HPMOR (
http://www.hpmor.com/chapter/39):
Well, sounding wise wasn't difficult. It was a lot easier than being intelligent, actually, since you didn't have to say anything surprising or come up with any new insights. You just let your brain's pattern-matching software complete the cliche, using whatever Deep Wisdom you'd stored previously.
"Headmaster," Harry said solemnly, "I would rather not define myself by my enemies."
Somehow, even in the midst of all the whirring and ticking, there was a kind of silence.
That had come out a bit more Deeply Wise than Harry had intended.
.
.
.
Now, how to phrase the rejoinder in such fashion that it also sounded incredibly wise...
"You are not Ravenclaw," Harry said with calm dignity, "and so it might not have occurred to you that to respect the truth, and seek it all the days of your life, could also be an act of grace."
The Headmaster's eyebrows rose up. And then he sighed. "How did you become so wise, so young...?" The old wizard sounded sad, as he said it. "Perhaps it will prove valuable to you."
Only for impressing ancient wizards who are overly impressed with themselves, thought Harry. He was actually a bit disappointed by Dumbledore's credulity; it wasn't that Harry had lied, but Dumbledore seemed far too impressed with Harry's ability to phrase things so that they sounded profound, instead of putting them into plain English like Richard Feynman had done with his wisdom...