This is from chapter 34 in A Farewell to Arms, at the end of a passage on loneliness that F. Scott Fitzgerald, upon reading the manuscript, called “one of the most beautiful pages in all English literature”:
“The world breaks everyone and afterward many are strong in 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.”