When it comes to our life and decisions, we’re optimistic rationalizers. Every New Year’s Eve, we take resolutions that are grounded in perfectly valid reasons – reducing weight, quitting cigarettes, reading more books and so on. If someone asks why we want to read books, we can confidently blurt out that it will expand our worldview.

Fast-forward a couple of weeks in the new year, and we’re often back to our old ways. It’s spectacular that even when we quit our yearly resolution within weeks, we always have good reasons for why we abandoned our goals. (We’d rarely acknowledge that we’re lazy or are addicted to cigarettes.) ...