There's a confidence that comes from youth and not knowing better. But there comes a point as an actor when you do know better and that is when the fear starts.
As repressed sadists are supposed to become policemen or butchers so those with an irrational fear of life become publishers.
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The universal human laws – need love for the beloved fear hunger periodic exaltation the kindness that rises up naturally in the absence of hunger/fear/pain – are constant predictable reliable universal and are merely ornamented with the details of local culture.