" One misconception about highly successful cultures is that they are happy, lighthearted places. This is mostly not the case. They are energized and engaged, but at their core their members are oriented less around achieving happiness than around solving hard problems together. This task involves many moments of high-candor feedback, uncomfortable truth-telling, when they confront the gap between where the group is, and where it ought to be. "

― Daniel Coyle , The Culture Code: The Secrets of Highly Successful Groups