Since Randy is posting DFW quotes, I’ll throw my fav from his Rolling Stone article, page 10
Now you have to pay close attention to something that’s going to seem real obvious. There is a difference between a great leader and a great salesman. Because a salesman’s ultimate, overriding motivation is his own self-interest. If you buy what he’s selling, the salesman profits. So even though the salesman may have a very powerful, charismatic, admirable personality, and might even persuade you that buying really is in your interest (and it really might be) — still, a little part of you always knows that what the salesman’s ultimately after is something for himself. And this awareness is painful … although admittedly it’s a tiny pain, more like a twinge, and often unconscious. But if you’re subjected to enough great salesmen and salespitches and marketing concepts for long enough — like from your earliest Saturday-morning cartoons, let’s say — it is only a matter of time before you start believing deep down that everything is sales and marketing, and that whenever somebody seems like they care about you or about some noble idea or cause, that person is a salesman and really ultimately doesn’t give a shit about you or some cause but really just wants something for himself.
I highly suggest reading the paragraphs that come after this one too.