There is a difference between a smart person and a know-it-all. The main difference is how you feel when they are in the room (and conversation) and when they leave. A smart person generally shares what they know in a way that builds trust while giving relatable context to the information. A know-it-all usually makes you feel dumb, insignificant, or upset.
But can you ever be too smart for your own good? Yes. There is a tipping point in us all. How or why it is triggered will vary based on our individual motivations and beliefs. But make no mistake about it, we all are dangerously close to making one bad decision.
That decision is that we are smart enough. Many people reach a point where they either have actively decided that they don't need to keep learning because "they know enough" or they don't believe there is anything else worth learning (they are the expert's expert).
As a business owner (or even a very high-level employee) this is can have a far-reaching ripple effect. I see this as "Willful Blind…