I’ve always been told that there is no difference if one is born smart and that the only difference is in the quality of education. Being smart and being educated are two totally different things and you can be very educated without being smart.
Some of the smartest people I know are 70-80 years old and went no further in school than the eighth grade. Some of the dumbest I know have graduated from college. Common sense can take you a long way in life.
And don't we have more than enough examples to support that! The universities are filled with educated morons (mostly within the faculty).