If we take the generally accepted definition of bravery as a quality which knows no fear, I have never seen a brave man. All men are frightened. The more intelligent they are, the more they are frightened. – George S. Patton
Of the primary emotions, fear is the one that bears most directly on survival. Children show fear. Adults try not to, maybe because its shameful, or, in some circumstances, dangerous. The fear response is automatic, though, and your body runs through its reflexes whether you want it to or not. – Sebastian Junger