"I think therefore I am," mind over matter, the little engine that thought he could -- our philosophers, language and literature all point to the power of perspective.

Psychologists say this common wisdom is right: What you expect from yourself and the world make a big impact on the results of your endeavors.

"From a neuroscience perspective, the brain will believe anything you tell it, right and wrong," said Roseann Capanna-Hodge, a psychologist based in Connecticut.

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