I understood the context. I don’t believe there is a mastering of one self.
Discussion
The only philosophical schools i know of that reach this conclusion are solipsism or nihilism. I personally don't find either one of them particularly useful. If, however, you are thinking about "mastery" in terms like "perfection" then yes, we can always be better. 😀
I have my own personal world view that has nothing to do with schools of thought. My assumptions come from watching my own thoughts and actions and are most certainly wrong. I sometimes am a disagreeable prick. You might be too. If so, we will just keep round after round. Both of us just essentially saying GFY. 😀