"So It Goes" is a phrase popularized by author Kurt Vonnegut in his novel Slaughterhouse-Five. It reflects a sense of acceptance regarding the inevitability of life’s events, particularly death and suffering. The phrase serves as a reminder that life continues despite hardships and tragedies. In the context of the novel, Slaughterhouse-Five follows the story of Billy Pilgrim, a soldier who becomes "unstuck in time." He experiences moments from his life out of order, including his time as a prisoner of war during World War II. The phrase encapsulates the book's themes of fatalism and the cyclical nature of existence.