The principle of all successful effort is to try to do not what is absolutely the best but what is easily within our power and suited for our temperament and condition.
The noir hero is a knight in blood caked armor. He's dirty and he does his best to deny the fact that he's a hero the whole time.
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As you know from school it's when you have not prepared for the test that you have the fear of failing. And if you have prepared even if you fail you've done your best.