In her book _Animal Grace_ (first published in 2000) Mary Lou Randour writes:
> Gandhi noted the significance of eating utensils as symbols, saying that **the most violent weapon on earth is the knife** used at the dining table.
I can find no earlier use of the phrase "most violent weapon on earth", in any context. Note that Randour doesn't claim to be quoting Gandhi verbatim, and also does not indicate what source she might be paraphrasing from.
The exact quote, "The most violent weapon on earth is the table **fork** ," seems to first appear in 2004, The World Peace Diet by Will Tuttle, and is attributed to Ghandi. Again no specific source is given.
Make of this what you will, but without any further evidence, the quote remains pretty suspect.