Doubt... or test? My assumption/belief is that Elizabeth Warren doesn't know what keeps people running. Your assumption/belief is that she does know what keeps people running. If we can test our assumptions/beliefs... then shouldn't we? Or is the possibility of being right better than the possibility of being proved wrong?
Really this is where betting comes into play..
A bet instantly raises the marginal private cost of error, which leads to a sharp increase in rationality. Faced with financial consequences, people suddenly - if temporarily - admit to themselves that they know a lot less than they like to believe - and bet accordingly. - Bryan Caplan, Beating the Odds: Why Do People Insist on Even Bets?
... which brings us back to Carnegie...
Yet you and I, if we examine the facts closely, will discover that the majority of our opinions, our most cherished beliefs, our creeds, the principles of conduct on which many of us base our very lives, are the result of suggestion, not reasoning… Prejudiced, biased, and reiterated assertions, not logic, have formulated our beliefs.
If you're not willing to bet that Elizabeth Warren knows what keeps people running... then this leads me to believe that you really haven't examined your belief.
Nobody "knows what keeps people running", and it takes a huge organization with experts in many different fields to give us SNAFU instead of total disaster.
Quotes are a unique enough medium of expression that I'm interested in viewing quotes that people have found collectable, emotionally impactful, useful, memorable, or otherwise noteworthy - perhaps others are similarly interested. To clarify, these need not be even remotely related to rationality. I'm hijacking the mandates traditionally used for the Rationality Quotes thread, with a few modifications:
Please post any meta discussion in the top-level comment named "Meta".