An amazing recent discovery of a handwritten diary from 1913 proves that such historic personalities as Freud, Adler, Wittgenstein, Hitler, Stalin, Schoenberg, Berg, Kokoschka, Klimt and Schiele knew each other intimately.
Optimism is an attitude. Overconfidence is an error in calculating statistical probabilities. As you think about the value of being optimistic, I encourage you to make a distinction between optimism and overconfidence.
A condition that many runners seek treatment for is associated with a painful bump on the back of the heel, caused by the back of the shoe consistently rubbing against the heel.