For Whom the Bell Tolls, Ernest Hemingway

"Often a man wishes to be alone and a girl wishes to be alone too and if they love each other they are jealous of that in each other, but I can truly say we never felt that. We could feel alone when we were together, alone against the others ... But we were never lonely and never afraid when we were together. I know that the night is not the same as the day: that all things are different, that the things of the night cannot be explained in the day, because they do not then exist, and the night can be a dreadful time for lonely people once their loneliness has started. But with Catherine there was almost no difference in the night except that it was an even better time. If people bring so much courage to the world the world has to kill them to break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry"