“Shimon his son says: All my days I have been raised among the Sages, and I found nothing better for oneself than silence; not study, but practice is the main thing; and one who talks excessively brings on sin.” Avos 1:17

Man is given a limited number of words in this world.  When he uses up the quota, his life is over. Hence nothing is as good for man’s physical existence as silence. ~ Tiferes Tzvi