Everyone is guilty of this. You, me, and everyone else on earth. Ignorance of your own ignorance is what buoys overconfidence in the first place.

From the article:

"The American author and aphorist William Feather once wrote that being educated means “being able to differentiate between what you know and what you don’t.” As it turns out, this simple ideal is extremely hard to achieve. Although what we know is often perceptible to us, even the broad outlines of what we don’t know are all too often completely invisible. To a great degree, we fail to recognize the frequency and scope of our ignorance."