These generic motivational quotes are tiresome. People have been talking for centuries about the power of positive thinking. The problem is that they end up underrating the necessity of expressing regret and disappointment. Trying to spin *everything* in a "positive" way is a surefire recipe for fooling yourself. There is a form of optimism that's healthy, and there is a form of optimism that is unhealthy. The unhealthy form can be taken to cruel extremes, such as the denial of people's real suffering.