people are born with unique intellectual capacities - areas of strength and areas of need, potentials and limitations. there are many forms of intelligence as well. Some of it can be cultivated and enriched but everyone has a « ceiling » too. As hard as i study - I will never work for NASA even though i consider myself to be pretty smart. but someone who works for NASA might lack social skills or some other important facet of intelligence. Some people might say they are stupid but no one can argue that stupid people work for NASA