Optimism and Pessimism

How do you know if you are a pessimist or an optimist? Perhaps by the way you answer this question: If I have a glass of water, do I say it is half-empty or half full? The answer not only indicates your character but also affects the way you live. An optimist may not think change is necessary, since things are okay now. On the other hand, he might also work hard for better conditions, in the happy belief that progress is possible and desirable. A pessimist may be discouraged from trying to make things better, or may be so dissatisfied with current conditions that he helps spur action for improvement. But an optimist is likely to be pleased with any good development and take pride in his role, however modest, while the pessimist, even if the catalyst for major reforms, will probably continue to disparage(criticize) the world`s shortcomings(flaw).