If you expect something to turn out badly, it probably will. Pessimism（悲观） is seldom disappointed. But the same principle also works in reverse. If you expect good things to happen, they usually do! There seems to be a natural cause-and-effect relationship between optimism and success.

Optimism and pessimism are both powerful forces, and each of us must choose which we want to shape our outlook and our expectations. There is enough good and bad in everyone's life -- ample（丰富的） sorrow and happiness, sufficient joy and pain -- to find a rational basis for either optimism or pessimism. We can choose to laugh or cry, bless or curse. It's our decision: From which perspective do we want to view life? Will we look up in hope or down in despair?

I believe in the upward look. I choose to highlight the positive and slip right over the negative. I am an optimist by choice as much as by nature. Sure, I know that sorrow exists. I am in my 70s now, and I've lived through more than one crisis. But when all is said and done, I find that the good in life far outweighs the bad.

An optimistic attitude is not a luxury; it's a necessity. The way you look at life will determine how you feel, how you perform, and how well you will get along with other people. Conversely, negative thoughts, attitudes, and expectations feed on themselves; they become a self-fulfilling prophecy（预言）. Pessimism creates a dismal place where no one wants to live.

Years ago, I drove into a service station to get some gas. It was a beautiful day, and I was feeling great. As I walked into the station to pay for the gas, the attendant said to me, "How do you feel?" That seemed like an odd question, but I felt fine and told him so. "You don't look well," he replied. This took me completely by surprise. A little less confidently, I told him that I had never felt better. Without hesitation, he continued to tell me how bad I looked and that my skin appeared yellow.

By the time I left the service station, I was feeling a little uneasy. About a block away, I pulled over to the side of the road to look at my face in the mirror. How did I feel? Was I jaundiced? Was everything all right? By the time I got home, I was beginning to feel a little queasy. Did I have a bad liver? Had I picked up some rare disease?

The next time I went into that gas station, feeling fine again, I figured out what had happened. The place had recently been painted a bright, bilious（胆汁的） yellow, and the light reflecting off the walls made everyone inside look as though they had hepatitis! I wondered how many other folks had reacted the way I did. I had let one short conversation with a total stranger change my attitude for an entire day. He told me I looked sick, and before long, I was actually feeling sick. That single negative observation had a profound effect on the way I felt and acted.

The only thing more powerful than negativism is a positive affirmation, a word of optimism and hope. One of the things I am most thankful for is the fact that I have grown up in a nation with a grand tradition of optimism. When a whole culture adopts an upward look, incredible things can be accomplished. When the world is seen as a hopeful, positive place, people are empowered to attempt and to achieve.