Bob Sutton

It’s interesting, the people who are really good at getting things done, they’re not just optimists. In fact, research shows they have high positive and high negative affect, which means they’re really optimistic and confident things will turn out in the end, but they’re really, really worried about every little detail and how it’s going to screw things up.

Daniel Kahneman

In many cases, what looks like risk-taking doesn’t take courage at all; it’s just unrealistic optimism. Courage is a willingness to take the risk once you know the odds; optimistic overconfidence means you are taking the risk because you don’t know the odds. There’s a big difference.

David Landes, The Wealth and Poverty of Nations

In this world, the optimists have it, not because they are always right, but because they are positive. Even when wrong, they are positive, and that is the way of achievement, correction, improvement, and success. Educated, eye-open optimism pays; pessimism can only offer the empty consolation of being right.

John Hamm

Optimism without grounded reality is a dream. Grounded reality without optimism is boring. People who are emotionally tough are always saying, “There’s got to be a way.” Business is not life-threatening; it’s ego-threatening. And the people who are willing to risk their ego are emotionally tough.