Thoughts about the Sentence: I Always Remain Relaxed ...

The second part reads: “… and thereby gain might over myself (= me self)”

What does it actually mean to gain 'might over oneself'? What or who is the 'me' and what is the 'self'? What (factors) of the human being belongs to the self? What do we mean, when we say: “It was I myself (= me self)?” Is 'me' and self the same as the self or the ego? Or is it the personality? Or is it both? Is it a good definition of yourself, when you draw up a curriculum vitae (CV), in which you write, what your name is, when and where you were born, what marital status you have, whether or not you have children, how good you were at work and what type of education and occupational experience you have and what extra-professional activities and sport activities you enjoy? I have searched in many books for the term, 'self', such as e.g. in John C. Eccles’ book, “How the Self Controls Its Brain”. The expression, 'self', can be found there loads of times, but he is unable to really say what is meant by this. It’s just the same with other scientists who dare to attempt a description of the human brain.