There has been a confusion in my mind for a long time.
　　
　　Once upon a time, whenever I was disppointed at a person's behaviour, one of my friend would tell me:
　　"You just isolate him/her in your life. Don't border this kind of person!"
　　And I did do this to some people, the ones that were not very important to me. In this way, I kicked them away from my daily life. Also, I kept myself in my small world.
　　
　　A few days ago, another friend told me:
　　"Sometimes you must smile to a person, even if you are so disgusted with him. Just like what others do. You are not a child any more."
　　And I saw she was doing this as well.
　　Is it a lesson that everyone must sit in? I know that this would bring much convenience to me. But how can it be? If everyone does this, how will this world be?
　　
　　(I wonder why I wrote it in English. Because of this edition?
　　Maybe.)