Thy Noblest Self

To thy noblest self be true
Is it true that we have more than one self?
Or is it true that we have more than one nature?
Or is it true that how we are, how we behave may vary from day to day and from hour to hour depending on our mood, our ability to deal with the stresses that come our way, our quality of self control, our depth of self understanding, and what is expected of us by ourselves and others?