Ilchi Lee says through his new book
Identify one habit in your life that you think causes some sort of difficulty for you. Ideally, this should be a purely behavioral issue, rather than one with a chemical component, such as smoking or drinking. In Hak Dahn Give yourself the challenge of stopping the behavior for twenty-one days. At the end of the twenty-one days, your dependence on that behavior will have faded along with the neural connections that support it.
