Positive or Negative ?

In this World if you are negative about things, people will scold you and say that you should be positive. But I ask them that if youkeep on thinking positive then how will you be able to get ready to face what is coming next. You have to be ready for the challenges which are to come for they may be positive or negative.I am not saying that you think negative but you should be 50-50. I mean to say you should not be too positive and not too negative. If you are only negative you will always be thinking about bomblasts and bullet firing etc. which is not good for your health.