Avoid Too Complicated Exercises
"I often think that teachers make a great mistake by giving too complicated exercises. A complicated exercise leads away from clear thinking and concentration. The simple exercise will never seem dull or dry if the pupil's ambition is right. After all, it is not so much what is done as how it is done. Give less thought to the material and more to the correction of the means with which one plays. There should be unceasing variety in studies. A change at every practice period is advisable, as it gives the pupil new material for thought. There are hundreds of different exercises in the different books, and the student has no reason for suffering for want of variety."