"Learned Optimism"

Optimism – reacting to setbacks from a presumption of personal power

Bad events are temporary setbacks
Isolated to particular circumstances
Can be overcome by my effort and abilities
Pessimism - reacting to setbacks from a presumption of personal helplessness:

Bad events will last a long time
Will undermine everything I do
Are my fault
Optimism psychology is in the field of cognitive science. It is not magic. But, the event-explanations of optimism can be practiced and learned, even by those who have not consistently used them previously.
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Pessimism is not constructive, whether or not it is accurate. Optimism is helpful, and the only way to go if you're going to keep going.