Poetry by Joseph Smith? That is certainly not what Joseph Smith is known for, nor is it often claimed that he was a poet in all the writing and studies made about him. [Orson F. Whitney is the exception that comes to mind.] But the following poem, when published in 1843, carried his byline when it was published. As a paraphrase of D&C 76, this poem fits well, I think with the Gospel Doctrine Book of Mormon lesson #41. As Christ teaches to the Nephites in this lesson (3 Nephi 22-26) he focuses on making sure that their scriptural cannon is complete, adding the neglected prophecies of Samuel the Lamanite and the to them unknown teachings of Malachi. And then he expounds all things unto them. Doesn’t section 76 have that kind of “exposition of all things” feel to it?