Mark Twain once observed that "it ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so." Few insights apply more directly to investing than this one.
There is a well-known framework describing four stages of learning. We begin unconsciously incompetent—unaware of our gaps. We then become consciously incompetent—aware of them. Then, with effort, we grow toward genuine competence. That second stage is the critical turning point. Recognizing what you don't know isn’t weakness; it’s the beginning of wisdom.