Unclean Language:

Rav Tzvi Hirsch Auerbach zt'l, Rov of Konin and author of Sefer Divrei Torah on Choshen Mishpat, once became very sick. A doctor came to check him and said, "Stick out your tongue." The doctor looked at his tongue and said, "This tongue is not clean." Rav Tzvi Hirsch sighed and said, "It's true. But who in today's day and age can say that their tongue is really clean?”