i believe that one of the main qualities a teacher must have is patience.
and an ability to answer the same question over and over again while talking to an adult (the student) who is not willing to even try and understand the answer to the question that has been posed.
patience. and an ability to deal with repetition. and the desire to help a student learn through his or her inability (or lack of care) to understand the material.
sometimes these are difficult qualities to possess one-hundred percent of the time.
but we keep marching on. (and answering the same question each time it is asked).