He's Not as Smart as He Thinks from Newsweek by Joan Raymond

Does any of this matter in the real world?
Men aren't more clever or smarter. But since they think they are, they are more confident about their abilities. These self-beliefs, however, may be highly adaptive. Who gets a job? A bright woman who doesn't think she's smart, or a not-so-bright man who believes he's capable of anything? Arrogance and hubris are not attractive qualities, but confident, self-belief may be. Certainly, underestimating abilities might hurt you. There's a good quote from one of your countrymen, Henry Ford. He says: "Whether you believe you can do a thing or not, you are right." And that is what is troublesome. Beliefs may be more important than actual ability in certain settings.