We numb ourselves too much these days. Sometimes we numb ourselves because of an underlying fear. Fear can play a big role in why sometimes people attend class with intentions of having their ego stroked. When we practice through love, love for ourselves, we don't need to seek the approval of others. With fear we stay on the defensive. As simple adjustment of a student on the mat who has been practicing yoga for "years" can sometimes really stir them up. Why would that people if the true intent is to let go.