Weeping and Wailing and Gnashing of Teeth

From the Joseph Smith manual yesterday we heard about the life to come.  I found an interesting quote by Joseph Smith that explains what causes the weeping and wailing and gnashing of teeth after this life.  I linked these scriptures to Alma 30:14.

Joseph Smith said: ““The great misery of departed spirits in the world of spirits, where they go after death, is to know that they come short of the glory that others enjoy and that they might have enjoyed themselves, and they are their own accusers.” (History of the Church, 5:425; from a discourse given by Joseph Smith on June 11, 1843, in Nauvoo, Illinois; reported by Wilford Woodruff and Willard Richards; see also appendix, page 562, item 3.)

Joseph Smith said: ““There is no pain so awful as that of suspense. This is the punishment of the wicked; their doubt, anxiety and suspense cause weeping, wailing and gnashing of teeth.” (History of the Church, 5:340; from a discourse given by Joseph Smith on Apr. 8, 1843, in Nauvoo, Illinois; reported by Willard Richards and William Clayton.) 

What does Gnashing mean?

Gnash - To grind or strike (the teeth, for example) together, to bite something) by grinding the teeth.