Michael Scott: And I'd like to start today by inspiring you. May I borrow someone's textbook, please? [A student hands Michael his text book] Thank you. What have we here? Ooh, economics. Very, very interesting. [rips pages out of the textbook] You cannot learn from books. [still ripping] Replace these pages with life lessons, and then you will have a book that is worth its weight in gold. I know, those are expensive, but the lesson is priceless. Good. All right, I think you're inspired. Shall we proceed? There are four kinds of business, tourism, food service, railroads and sales. And hospitals/manufacturing. And air travel.

Michael Scott: Yeah, sure. You know business. Sitting up here in your ivory tower and your ebony tower. Well, you know what? I tell you one thing, Dunder Mifflin is here to stay!
Student: But how can you compete against a company with the resources of a nationwide chain?
Michael Scott: David will always beat Goliath!
Student #2: But there's five Goliaths. There's Staples, OfficeMax-
Michael Scott: Yeah, yeah. You know what else is facing five Goliaths? America. Al-Qaeda, global warming, sex predators... mercury poisoning. So do we just give up? Is that what we're learning in business school?

Michael Scott: What is the most inspiring thing I ever said to you?
Dwight K. Schrute: "Don't be an idiot." Changed my life.
[aside to camera:]
Dwight K. Schrute: Whenever I'm about to do something, I think, "Would an idiot do that?" And if they would, I do not do that thing.