The Law of Practice states that whatever thought or action your repeat often enough becomes a new habit. You can develop any habit you consider desirable or necessary. You can become the kind of person you want to be if you can discipline yourself to think and act in a way that is consistent with your new, higher ideals long enough for them to become new habits. This is how you become a new and better person.
Your ability to take control of your mind and begin thinking the kind of thoughts that lead to the outcomes you desire is the starting point of the process that leads to complete freedom, happiness and self-expression.