If successful, a teacher may play the role of an assistant or a catelyst in the learning process. But the most important role is preserved for oneself, the person who is after all supposed to do the learning. A passive attitude is not the best attitude for learning. To learn, one must be interested in the matter, one must be eager to learn, have an open mind, be willing to let go prejudices and false presumptions. To learn, one must be willing to change as a persson, since new ideas have thc potential to reshape one's personality.
Personal development goes hand in hand with learning.
Just like school is a bad place to learn, attending school is not very beneficial for one's personal development either. The greatest barrier both for learning and for personal development is the passive attitude cultivated by school. How to learn is the key to one's personal development and the school method of learning can clearly not be recommended. Personal development can hardly be gained by remaining a passive observer. For the sake of personal development, it is better to learn by personal experience, rather than to try and absorb knowledge and skills gained by somebody else.