If I were to act like Marcus Aurelius there would be a couple of reasons why I do what I do. I would act stoic and not phased really by anything because I would not want to show emotions to others. Showing emotions is showing weakness. You do not want to be put in the position of being weak. Also I would do what I do based on looking inward and understanding myself and understanding then my place in society or "the cosmos". Then I would know my place in life and what makes me happy. From there I would channel all of my energy to the things I find important and what makes me happy. Judgments from other people don't bother me because it doesn't personally matter to me.