Ernest Hemingway said this quote

“ I hope I am not for the killing, Anselmo was thinking. I think that after the war there will have to be some great penance done for the killing. If we no longer have religion after the war then I think there must be some form of civic penance organized that all may be cleansed from the killing or else we will never have a true and human basis for living. The killing is necessary, I know, but still the doing of it is very bad for a man and I think that, after all this is over and we have won the war, there must be a penance of some kind for the cleansing of us all. ”