Musar su Proverbi 20:15

And the fifth section: Vulgar speech. Our Rabbis, may their memory be blessed, said (Shabbat 33a), “Anyone who speaks vulgarly - even if he was sealed for a decree of seventy years of good, it will be reversed to bad.” And Isaiah said (Isaiah 9:16), “That is why my Lord will not spare their youths, nor show compassion to their orphans and widows; for all are ungodly and wicked, and every mouth speaks vulgarity.” And on account of this, one who speaks vulgarly has a heavy iniquity and is ungodly and wicked. For he has abandoned and left shame and modesty, which are the famous traits of the holy seed (of Israel); and went to the paths of brazenness - which is the trait of the evil boors. Secondly - because he has profanced the Holy One of Israel, as it is stated (Deuteronomy 4:6), “and they will say, ‘Surely, that great nation is a wise and discerning people.’” But this one acted like the disgusting foolish ones that are distanced from the ways of the intellect, which is completely beautiful and also pleasant. And their foulness rises and their stink goes up, so every sage and understanding person surely despises and surely abominates them. And behold, he is profaning the tool of the intellect which is more precious than any beloved tool - as it is stated (Proverbs 20:15), “but wise speech is a precious tool.” And the punishment of one who listens to vulgar speech is great, since he does not seal his ear and does not separate from the words of vulgarity. And about him is it said (Proverbs 22:14), “The mouth of a forbidden woman is a deep pit; [He who is doomed by the Lord falls into it].”