The pleasant life: a life that successfully pursues the positive emotions about the present, past, and future.
Martin SeligmanOptimism is a tool with a certain clear set of benefits: it fights depression, it promotes achievement and produces better health.
Martin SeligmanOn the relationship side, if you teach people to respond actively and constructively when someone they care about has a victory, it increases love and friendship and decreases the probability of depression.
Martin Seligman