Marie Callas constantly reminds me that we have to know ourselves better than anyone else. I truly appreciate her advices as they are words of wisdom. There is a need to be in harmony with your inner self, only in this case than you can know what goals to take and what path to go in life. True self is what you are talking here, not something that is superficial.
The big question now is, how do you build up a harmonious relationship with your true self?
Marie Callas says, have a deep reflection of yourself spiritually, just like you look at yourself at a mirror.
Reflect on what you truly seek, your likes and dislikes, habits and negative thoughts. How about accepting the responsibility of all the wrongs you did in the past and accept yourself as who you really are and your place in this world. Be honest and truthful to yourself and be responsible to your self.
In short, successful people have good relationship with themselves. That is why they thrive in everything they do. They know themselves very well.