The contrast between 38 and 29 is instructive. Samuel tells them Nephites that is a point at which they will have gone too far. There is a point where their “destruction is made sure.” Fortunately, verse 39 tells them that there is still a chance to repent, so that dire time is not yet. It approaches rapidly, however.
Textual: There is no chapter break in the 1830 edition. All of the preaching of Samuel is contained in one chapter.