In the first Men in Black movie, Will Smith ("J") at first refuses to believe Tommy Lee Jones ("K") that the earth is playing host to thousands of creatures from other planets. K dismisses J's "knowledge":
"Fifteen hundred years ago, everyone KNEW the world was the center of the universe, 500 years ago everyone KNEW the earth was flat, and 15 minutes ago you KNEW we were alone on this planet. Imagine what you'll KNOW tomorrow!"
What do you really know?
If you've ever been involved in teaching, whether it is teaching history to a room full of bored eighth graders, teaching dog obedience to a bunch of frisky pups and their masters or teaching a Lenten Bible study, you quickly come to one conclusion: The more you endeavor to become learned, the more you define yourself a learner.
The more we "know," the more embarrassingly obvious it becomes how much we have to learn. (Leonard Sweet, "Live and Learn.")