There are physical characteristics which are inherited. These include things like good looks, high intelligence, physical coordination. These attributes contribute to success in life, and success in life is a determinant of optimism.
Martin SeligmanThe defining characteristic of pessimists is that they tend to believe that bad events will last a long time, will undermine everything they do, and are their own fault. The optimists, who are confronted with the same hard knocks of this world, think about misfortune in the opposite way. They tend to believe that defeat is just a temporary setback or a challenge, that its causes are just confined to this one case.
Martin SeligmanOptimism is a tool with a certain clear set of benefits: it fights depression, it promotes achievement and produces better health.
Martin SeligmanChanging the destructive things you say to yourself when you experience the setbacks that life deals all of us is the central skill of optimism.
Martin Seligman