When I was a child in an elementary shool about twenty years ago,I attended a lecture which was given by a strange old teacher of other school.Sorry for that I forgot his name and the main contents of his lecture.It's so far far away.But there is one sentence he told us that I will never forget.I remember what he said:There are two different little persons in your brains.One is white, the other is black.The white little person let you achieve success but the black little one lead you to the failure.They fight for everything. All your life,all the time you only have to do one thing that you help the white little person beat the black one.

I realize the old teacher told me the contrary double sides of our spirits.We can call them the good side and the wicked side. I suppose everyone has a glorious dream in the deep of his spirit.And most of the people can have a good beginning and insist on it.But on the way to get them,we must confront the acute affections given by the double sides.The good side in our minds teaches us kindness\perseverance\wise etc.all kinds of wonderful characters lead us to happiness. The wicked side brings us greed\fall\ignorance and so on. drive us to the darkness.we really want to keep the good side only,but we can't.They are always in an endless battle.we can't avoid their meeting.However,as the old sage said,We should do our best to be with the good side always and be far away from the opposite side anytime.