Mule explanation

 “The whole notion of my unusual power seems to have broken on me so slowly, in such sluggish steps. Even toward the end, I couldn’t believe it. To me, men’s minds are dials, with pointers that indicate the prevailing emotion. It is a poor picture, but how else can I explain it? Slowly, I learned that I could reach into those minds and turn the pointer to the spot I wished, that I could nail it there forever. And then it took even longer to realize that others couldn’t.

Chapter 26