What effect is created by the shifts of narrative voice from third to first narrative in "Their Eyes Were Watching God"?

Hurston moves away from third person narrative to free indirect discourse. Their Eyes began in third person, told through the voice of Hurston. From this point on, particularly in the novel's more important moments, the voices of Hurston and Janie merge. Although much of the novel is told in third-person omnicient, certain sentences like "So this was marriage!" (discribing the pollination of the pear tree) allow the reader to hear Janie's thoughts directly.