People assume it’s a matter of personality, the difference between optimists and pessimists. But I believe it all comes down to an inability to forget. The greater your powers of retention, the slimmer your chances at optimism.

Optimism sounds like a sales pitch. Pessimism sounds like someone trying to help you.

The optimist believes that bad events have specific causes, while good events will enhance everything he does; the pessimist believes that bad events have universal causes and that good events are caused by specific factors.

Despair is a form of certainty, certainty that the future will be a lot like the present or decline from it. Optimism is similarly confident about what will happen. Both are grounds for not acting. Hope can be the knowledge that reality doesn't necessarily match our plans.

It is not usually our ideas that make us optimists or pessimists, but it is our optimism or pessimism that makes our ideas.

•Scepticism and pessimism aren’t synonymous. Scepticism calls for pessimism when optimism is excessive. But it also calls for optimism when pessimism is excessive.

Pessimism doesn’t change the reality; it prolongs the status quo. And it brings everyone down. It’s only ever lose-lose. Optimism and faith coupled with pragmatism change the reality. Self-belief and self-reliance change the reality. Boldness to explore new ideas changes the reality. A vision powered by effort and energy changes the reality.

If you’re going to make an error in life, err on the side of overestimating your capabilities (obviously, as long as it doesn’t jeopardize your life). By the way, this is something that’s hard to do, since the human capacity is so much greater than most of us would ever dream. In fact, many studies have focused on the differences between people who are depressed and people who are extremely optimistic. After attempting to learn a new skill, the pessimists are always more accurate about how they did, while the optimists see their behavior as being more effective than it actually was. Yet this unrealistic evaluation of their own performance is the secret of their future success. Invariably the optimists eventually end up mastering the skill while the pessimists fail. Why? Optimists are those who, despite having no references for success, or even references of failure, manage to ignore those references, leaving unassembled such cognitive tabletops as “I failed” or “I can’t succeed.” Instead, optimists produce faith references, summoning forth their imagination to picture themselves doing something different next time and succeeding. It is this special ability, this unique focus, which allows them to persist until eventually they gain the distinctions that put them over the top. The reason success eludes most people is that they have insufficient references of succeeding in the past. But an optimist operates with beliefs such as, “The past doesn’t equal the future.” All great leaders, all people who have achieved success in any area of life, know the power of continuously pursuing their vision, even if all the details of how to achieve it aren’t yet available. If you develop the absolute sense of certainty that powerful beliefs provide, then you can get yourself to accomplish virtually anything, including those things that other people are certain are impossible.

I am not optimistic or pessimistic. I feel that optimism and pessimism are very unbalanced. I am a very hard engineer. I am a mechanic. I am a sailor. I am an air pilot. I don't tell people I can get you across the ocean with my ship unless I know what I'm talking about.

The pessimist waits for better times, and expects to keep on waiting; the optimist goes to work with the best that is at hand now, and proceeds to create better times.

Pessimism is a very easy way out when you’re considering what life really is, because pessimism is a short view of life. If you look at what is happening around us today and what has happened just since you were born, you can’t help but feel that life is a terrible complexity of problems and illnesses of one sort or another. But if you look back a few thousand years, you realize that we have advanced fantastically from the day when the first amoeba crawled out of the slime and made its adventure on land. If you take a long view, I do not see how you can be pessimistic about the future of man or the future of the world.

"What is an optimist? The man who says, "It's worse everywhere else. We're better off than the rest of the world. We've been lucky." He is happy with things as they are and he doesn't torment himself.

What is a pessimist? The man who says, "Things are fine everywhere but here. Everyone else is better off than we are. We're the only ones who've had a bad break." He torments himself continually."

It is because I reject lies and running away that I am accused of pessimism; but this rejection implies hope — the hope that truth may be of use. And this is a more optimistic attitude than the choice of indifference, ignorance or sham.

The Pessimist Sees Difficulty In Every Opportunity. The Optimist Sees Opportunity In Every Difficulty.