I don't believe in pessimism. If something doesn't come up the way you want, forge ahead. If you think it's going to rain, it will.
In the long run, the pessimist may be proven right, but the optimist has a better time on the trip.
I guess I just prefer to see the dark side of things. The glass is always half-empty. And cracked. And I just cut my lip on it. And chipped a tooth.