SJS: You missed the following I posted:
Neither is Yiddish the “language of the Jew”, any more than a black hat is the “clothing of a Jew.” But just as the purpose of the hat is “lo shinu es malbushayhen” – we want to dress differently than the seculars – the purpose of Yiddish is “lo shinu es shemom” – we want to talk differently than the seculars.