My first memory of being absolutely wrong about everything in the world:
I was maybe four of five and had just learned how to add at day care.
Johnny has two apples, Alice has three... No problem.
Never again would I be caught slack jawed, blindly guessing at the total produce in the possession of friends and acquaintances. I had just acquired the gift of certainty.
As my dad was driving me home, I stared out the car window flush with the wondrous realization that I had pretty much learned everything I would ever be taught. Sure, I knew there were some things I'd learn later, like multiplication once I got to fourth grade, but other than that, I had pretty much learned the last thing I really needed in life.
Later that day, in the garage, i was dribbling a basketball since, remember, I'd accomplished all the education I'd ever need, so I deserved a little R & R. But my dad came in and told me I was doing it wrong. I was slapping at the ball with my palm instead of pushing it lightly with my fingers. As I tried it his way, it dawned on me that, perhaps, there really was more to learn past pre-school.
Twenty five years later, I went to grad school because I believed there was more to learn past pre-school and high school and college. And if I learned anything during my MFA, it was how much I still need to learn regardless of what degrees i accumulate. Also, my dribbling is no better than when my dad first taught me. That's probably not gonna get any better, even if I seek a PhD.