I should also mention that Rabbi Frand’s source in WIY’s link, a sefer ???? ????? (a modern sefer from bnei brak), also cites a Chida who says al pi kabbalah that you should not speak extra words because words are a piece of your neshama.
That probably comes more from the idea that humans are a ??? ????, that our neshama is special in some way because we speak. So words are a part of your neshama.
Just wanna also point out here, that that idea doesn’t at all hint either that you die faster if you talk more.