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We hear about the impostor syndrome, the wisdom of imagining the great in their bathrooms, and what Nietzsche and Montaigne (among others) have to tell us about resilience and courage.
We often stay stuck with the level of confidence we have because we regard being confident as a matter of good luck. In fact, the opposite is true: confidence is a skill based on ideas about our place in the world, and its secrets can be learnt.