2 Nephi 1:14 Awake! and arise from the dust, and hear the words of a trembling parent, whose limbs ye must soon lay down in the cold and silent grave, from whence no traveler can return; a few more days and I go the way of all the earth.
"No traveler returns"... is from Hamlet's "to be, or not to be" soliloquy.
It is problematic in Hamlet as the play opens with Hamlet speaking to his ghost of a father and being told in no uncertain terms, 'avenge me'. Well apparently there's a traveler returning. Though Amanda Mabillard opinion (which was the first I saw of the theory) seems pretty good in that the speech is suppose to be before the rest of the play.
However, Joseph's Smiths use of Shakespeare is more problematic than even Shakespeare's use of Shakespeare. First, Smith is, in effect, saying that Jesus isn't going to rise from the dead as predicted. Nobody can return from "whence" -- and secondly he closes the door Shakespeare left open. Smith's version reads "from whence no traveler can return" -- he is outright denying the resurrection is even possible.