Brothers & Sisters,
As the quote always says "you should never stop learning," this could not be closer to the truth. Teaching has a way of making one shed their pride, show them humility and illuminate their minds. Let us dive into these concepts a bit further.
Whether it is a group of college-aged students, adults or middle-schoolers even attempting to think the scales of knowledge tip mostly towards the professor would be an incorrect assessment. While the teacher might hold a specific greater knowledge about the particular lesson that is taught the students possess knowledge about a slew of other things that perhaps might prove invaluable. Therefore the proctor should never hold themselves in too high of esteem as to not be able to listen to the crowd of voices and the knowledge it contains. An open mind can usually correlate a classroom lesson to a happening in life where an equal or greater lesson was also learned.
The sharing of information between humans is how society grows and expands. There is no age restriction on who should share with who. One might argue that even an infant could teach an older adult something they do not have knowledge about, perhaps patience or a deeper understanding of love. Once pride has been set aside, and humility grasped at and attained by everyone within the specific learning environment then and only then can the actual act of learning begin. An arrogant and prideful professor is one that does not benefit those who have come to hear the presented information.
It is with this knowledge then that one can ultimately understand and appreciate the wonder that is the human mind. If we are to agree that human minds are all radically different in the depth and breadth of their knowledge base, then the agreement can also be made that there is always something to learn and to teach.