Not knowing that something cannot be done, you are likely to waltz into uncharted minefields where angels before you have feared to dance. Astonishingly, you may be fortunate enough to succeed, to some degree or another. Conventional wisdom will then be revised by those around you and the next generation will be taught that what you did can always or often be done – only to discover, when they attempt it themselves, that in reality you missed every landmine by pure, dumb luck.