There are two types of people in the world - educated and uneducated. One is stupid, the other does not know they are stupid.
This is my favorite: the majority of university professors are people who failed in the real world, yet pass on their knowledge as an example of how YOU can succeed.
similar to that one:
Professors of science, biology and chemistry are both teacher and student as they are learning and exploring alongside their students. All other professors are parrots, reciting opinions that have been repeated so many times they are believed to be facts. Shakespeare so elegantly proves “a rose by any other name smells just as sweet”. Yet for all our we know, a rose may have been an onion all along. ~Einstein