"“A long habit of not thinking a thing wrong gives it a superficial appearance of being right.” — Thomas Paine
This is the danger of not questioning our assumptions and not examining different ways of looking at an issue. We'll also generally look for ways to justify our actions and thinking....
Critical thinking is crucial for good decision-making. Here are some great TED talks to help understand how we make choices.
How to get out of the box and generate ideas: Corazza is a full-time professor at the Alma Mater Studiorum at the University of Bologna, a member of the Executive Council, and the founder of the Marconi Institute of Creativity. He teaches science and the applications of creative thinking. Why/Which/How/Where/What/When/Experiment. A quick jump out of the box is more insightful than a lifetime of standard thinking.