In Seligman's book Learned Optimism. He explains of his work with a Life Insurance company called Met Life. Seligman worked with the CEO to develop a test that would better predict the success of Life Insurance agents...what Seligman added to the test: optimism. Seligman and the CEO turned out to be right; the more optimistic the agent the better he performed and the longer he stuck around.
Seligman says the recipe for success includes three determinants: aptitude, motivation, and optimism.
Which reminds me of that Disney Channel movie:
"si, se puede...Yes, we can!"
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