Hearken, O Ye Gentiles

3 Nephi ends on this warning note.  I have two thoughts.  First, we've spent most of 3 Nephi literally or figuratively in a temple setting: this is a description of the world outside the temple, that must be forsaken to become a shalem.  Second, I think we could read the addressed "gentiles" as today's secular world.  That would be a comfortable reading, and I think it would be mistaken.  A book can only be addressed to its readers.