Chassidic master Rabbi Mendel of Kotzk once referred to a certain rabbi as
ah tzaddik in peltz -- "a righteous person in a fur coat."
The Kotzker explained: When it is winter and it's freezing cold, there are two things one can do. One can build a fire, or one can wrap oneself in a fur coat. In both cases, the person is warm. But when one builds a fire, all who gather round will also be warmed. With the fur coat, the only one who is warmed is the one who wears the coat.
So it is regarding spiritual warmth -- one can be a tzaddik in a fur coat....
