We all agree that pessimism is a mark of superior intellect.

Pessimism never won any battle.

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.

Optimism doesn't wait on facts. It deals with prospects. Pessimism is a waste of time.

In securing the future of the planet, we secure happiness for ourselves. One of the aims of the Greens is to turn around the tide of pessimism amongst the young people of the world.

Pessimism, when you get used to it, is just as agreeable as optimism.