洁身自爱
      Explanation: Maintain their own purity, not join them. Also refers to the fear of unassuming, their own interests is good, do not care about public things.
      Source: "Mencius million chapter on": "return to clean the body and that is all."
      Examples: Vertical to the life force, had to work on time, but also when ~, is not the same table with people eating, with the cup of tea, so as not to spread bacteria and harming others. (Ba Jin "Cold Night")