"No man is an island entire of himself; every man is a piece of the continent, a part of the main... Any man's death diminishes me because I am involved in mankind and therefore never send to know for whom the bell tolls; it tolls for thee." -John Donne
Based on Ernest Hemingway's experiences during the Spanish Civil War, For Whom the Bell Tolls tells the story of American soldier Robert Jordan, whose love for a Spanish girl clashes with his sense of duty to fight for his country.
I didn't much like any of Hemingway's other works, but I do like this one very much. It describes the brutality of war and the human capacity for love.