I believe that the intention behind teaching matters a lot. For example, if I teach something with the intention that 'this is a very difficult concept/technique, only few can learn it, etc', then it will naturally be difficult for the learner to feel comfortable learning it because he/she has the constant insecurity about fully grasping it. On the other hand if the teacher is secure about the concept and teaches with the intention that 'this is not a big deal, just break it down like this and now you can clearly see how combines itself logically', this gives student the confidence that he/she can learn it too. I had a student who always told me she cannot play Fur Elise because she does not understand how to use arm weight for the melody. I asked her to not think much but rather focus just on the circular movement of the elbows while playing the 1st section. I was then able to explain how the rotation of the elbows causes the finger to approach the keys 'sideways' instead of approaching it from 'top'. This brought about a massive change of sound and ease in her movements. I thus concluded that using the circular movements of the elbow, she was using more of her arms, which essentially is the concept of arm-weight. I believe teaching demands one to have such an enthusiasm for the subject that it becomes contagious, it requires one to understand that there can be multiple ways to reach the same outcome, to be able to operate different methods based on the nature of reception and to be patient with the process.