The point is that you do not love yourself - otherwise you would love both your own nature and her purpose for you. Other men love their own pursuit and absorb themselves in its performance to the exclusion of bath and food: but you have less regard for your own nature than the smith has for his metal-work, the dancer for his dancing, the money-grubber for his money, the exhibitionist for his little moment of fame. Yet these people, when impassioned, give up food and sleep for the promotion of their pursuits: and you think social action less important, less worthy of effort?
Perhaps one of the most oft-quoted passages from Marcus - at least from my perspective.
Our nature is such that we get up each day and work. We perform work on our own; we work with those we love; we work with those who are grumpy; we work with what life throws at us each and every day.
We who strive to live philosophically, ought to have as much love for our work as those who are entirely consumed in their professions. People who are so passionate about what they do, they forego sleep and food. As a prokopton, we too ought to have as much passion about our trek on the path to moral greatness.