This memorable phrase emphasizes that the principles exist because they are attitudinally useful in most real-world situations. They don't establish metaphysical terra firma . Change can be fast and easy. All distinctions human beings are able to make concerning our environment and our behavior can be usefully represented through the visual, auditory, kinesthetic, olfactory, and gustatory senses. People create their own experience.
Experience has a structure.
The mind and body are part of the same system, and affect each other. There is no failure, only feedback. There is a solution to every problem. I am in charge of my mind and therefore my results. The ability to change the process by which we experience reality is often more valuable than changing the content of our experience of reality.