It’s not always obvious which wellspring of credibility we should draw from. What Marshall showed so brilliantly was perseverance—knowing when it was time to draw on a different well. In this chapter we’ve seen that the most obvious sources of credibility—external validation and statistics—aren’t always the best. A few vivid details might be more persuasive than a barrage of statistics. An antiauthority might work better than an authority. A single story that passes the Sinatra Test might overcome a mountain of skepticism. It’s inspirational to know that a medical genius like Marshall had to
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