The author of this article provides rational reasons for optimism and for removing people who complain from your life.
11 min YouTube video with material compelementary to the "Happiness Advantage."
There is an association between resilience and a positive construal, where resiliience is the capacity to recover quickly from difficulties (i.e., a toughness), and construal is a social psychological term that refers to the way in which (or the process of) people perceive, comprehend, and interpret the world around them.