There is a well-known proverb，"Every horse thinks its own pack heaviest," which means whether people feel optimistic or not lies in what attitudes they adopt. It is universally acknowledged that life is by no means perfect and a positive attitude makes life brighter. As the case stands, it is our attitude rather than the situation itself that determines how we feel. On the one hand, a positive mind brings about an active life, because to be in a good mood or a bad mood is at one’ s own choice. On the other hand, looking at the bright side of the situation and remaining cheerful work out quite well when one is confronted with adversity. In such a rat-race society, everyone is bound to encounter difficulties. In my opinion, we should keep an optimistic attitude to pull through any hardship, as we can say "attitude is everything".