"Ultimately it's about the forces of fear and heroism of our hearts"

Is Berlin saying that you have to forget the fear and be a hero? That you can't think about all the bad that is going on but where you can make it positive? The bravery and courage of this soliders is heart touching. I truley believe that Berlin is an amazing character. Tim O'Brien did a great job on Paul Berlin, I just wonder if this is how Tim O'Brien was when he was in Vietnam.