My blog post on Come Follow Me: D&C 18-19
Excerpt:As we continue studying the revelations of Joseph Smith, we see that some doctrines are expanded and some are completely reinvented, as God gives us higher understanding of his kingdom. Joseph’s revelations will become more complex, intricate, and expansive as the years go by.
This revelation was given in June 1829, about the time the Melchizedek Priesthood was restored by the ancient apostles, Peter, James and John. The Book of Mormon translation was not yet finished. With these two key ideas in mind, let’s see what the Lord taught Oliver Cowdery.