"At times the limitations we impose upon ourselves seem to have a life of their own. They resist being changed by fighting against the changes that we are trying to make in our lives. It may be that, if we do not find a new task difficult and imposing on everyday life, we are not taking it seriously enough. Only when we take up something that threatens our established patterns do our limitations seek to preserve themselves, so the fact that you might be coming up with attractive excuses to keep you from practice can be taken as a good sign. But the only way you will change the pattern is to keep trying until you change it. This often requires determination, tenaciousness, and sheer bloody-mindedness—all in themselves, qualities that are useful for the budding magician."