Some people with high IQs get complacent, and, secure in their mental superiority, they lose the curiosity essential to achieving anything new. Learning facts, playing by the existing rules of domains, may come so easily to a high-IQ person that he or she never has any incentive to question, doubt, and improve on existing knowledge. This is probably why Goethe, among others, said that naïveté is the most important attribute of genius.
