A preconceived notion is like having tunnel vision. You miss a lot.

The brain has only three functions: open, closed, or deprived.

Listen to others with an open mind. Normally, that leads to a pleasant conversation.

One whose auditory sense has been accustomed to being comfortable with one kind tune misses out the spectacularity of the symphony.

A mind is capable of harboring and ingesting a vast variety of ideas and information. It would be the greatest crime against itself when it only permits its faculties the access to a monotonous inference, whereas it extinguishes its potence of immeasurable creativity. 

There is no lack of access to knowledge today. Education then must be focusing on strengthening the will to seek the truth, which comprises to a large degree of opening the minds to alternative views and instigating earnest processes in forming independent assessments.