"His point is that when the two seem incompatible we often hang onto the plan, ignore the warnings reality offers us, and so plunge into trouble. Afraid of the darkness of the unknown, the spaces in which we see only dimly, we often choose the darkness of closed eyes, of obliviousness. Gonzalez adds, "Researchers point out that people tend to take any information as confirmation of their mental models. We are by nature optimists, if optimism means that we believe we see the world as it is. And under the influence of a plan, it's easy to see what we want to see." It's the job of writers and explorers to see more, to travel light when it comes to preconception,"