The last three paragraphs of "Revelation" present a vision in which throngs of people are entering heaven. Mrs. Turpin, who sees the vision, has always regarded herself as a good Christian, but she now sees herself and her husband "bringing up the end of the procession." They are preceded by many of their social inferiors, both Black and white, whom Mrs. Turpin has dismissed as trash.
Although the self-consciously virtuous people like Mrs. Turpin are ascending to heaven in the vision, the fact that they are last in line is a shock to her. They also seem to be undergoing some sort of purgation (or purgatory) on the way, as "even their virtues were being burned away." They will achieve salvation—but not easily or for the reasons they had assumed.
In the last paragraph, Mrs. Turpin hears the chorus of crickets, a sound which must be familiar to her, but this evening it sounds like the souls of the blessed shouting "hallelujah." The fact that she gives such religious significance to a commonplace sound suggests how overwrought Mrs. Turpin is and how obsessed with the idea of salvation. The image also brings the story back to earth after the grandiose description of her vision of heaven.