What science reveals about the benefits of positive thinking

Henry Ford famously noted, “Whether you think you can do it or not, you are usually right.” His point was that beliefs, especially about our talents, performance, and even luck, can be self-fulfilling. Irrespective of whether they are right or wrong, they will become true by influencing objective success outcomes.

Ford was hardly alone. Along the same lines, decades of psychological research show that beliefs matter, often profoundly so. Perhaps the most influential work comes from Albert Bandura’s theory of self-efficacy...