Ah, mastery... what a profoundly satisfying feeling when one finally gets on top of a new set of skills... and then sees the light under the new door those skills can open, even as another door is closing.
All changes, even the most longed for, have their melancholy; for what we leave behind is a part of ourselves; we must die to one life before we can enter into another!
Would that there were an award for people who come to understand the concept of enough. Good enough. Successful enough. Thin enough. Rich enough. Socially responsible enough. When you have self-respect, you have enough.