INFJs tend to be the most intelligent of the Feeling types. They have the third highest IQs overall, behind INTJs and INTPs and ahead of INFPs. They tend to be much smarter than any extroverted or sensing types. There is a weak correlation between thinking preferences and IQ, a strong correlation between IQ and intuition, and a strong correlation between IQ and introversion. The comparative IQ rankings between MBTI types are mostly quite predictable, but ESTPs do surprisingly well compared to introverted sensors.