People don’t plan to be wrong enough.
I don’t mean “intend to be wrong.” Intent or no, you’re going to be wrong sometimes. People don’t plan for that; they don’t insure against it. They just operate with a life plan that requires them to be flawlessly correct about everything.
This is why people lose their money or their jobs or get in car accidents. They aren’t planning for the times when they’ll be wrong.
If you see someone driving with only a scant few feet between them and the car in front of them while doing 70 on the highway, that person’s life plan requires that they are flawlessly able to predict and react to any sudden movements from the car in front of them. That’s a bad life plan, because they can’t – they’ll be wrong, and it only takes being wrong once in that scenario to give you a very, very bad day.
Don’t live your life in such a way that only works if you never make a mistake. Give yourself zones of safety, trusted people to double-check your thinking on important decisions, and backup resources. Intend to be right, but plan to be wrong.
The Opportunity Machine 