Hemingway utilizes an interesting combination of stylistic elements in For Whom the Bell Tolls to achieve the novel's intended effect. One such stylistic element is the use of run-on sentences, often during stream of consciousness segments. Hemingway frequently utilizes run-on sentences in this manner to evoke the run-on nature of human thought and emotion. A person's thoughts rarely maintain the well-ordered structure often accorded them in traditional narrative style. One does not think, naturally, with the direction of a plot in mind—hence, the usage of run-on sentences in stream-of-consciousness segments, as opposed to in dialogue-heavy excerpts.
In keeping with the stream-of-consciousness style, characters' perspectives blend into one another at times, creating the impression of connection between individuals. This ties into the central thesis of the novel and its title, both of which contend with death, war, and the interpersonal relationships involved.
Hemingway also frequently uses thou/thee/thy, or other older English words, in dialogue-heavy sections to denote that Jordan is speaking Spanish with his colleagues and friends. This may be to mirror the old-world turns of phrase Jordan notes that characterize this particular Spanish dialect. These older English words may also be a means of calling back to chivalric literary tradition; a means of characterizing the romanticized and intense relationships between Hemingway's characters.