Upvote:2
The teachings in James 3 on the relations between language and character are certainly in accord with the rest of LDS teaching and could profitably be more repeated and expounded more than they are.
However, in addition, Nephi mentions speaking with the tongue of angels (2 Ne 31:14 and 32:2) as one of the gifts of the Spirit, one that is not mentioned in the other lists. The injunction "I am God; give heed to my word, which is quick and powerful, sharper than a two-edged sword, to the dividing asunder of both joints and marrow" is repeated several times in the early revelations in the Doctrine and Covenants (as well as Hebrews 4:12)
These teachings suggest that the popular notion that crude, vulgar, obscene, or profane speech is especially strong or expressive is entirely wrong.