A Rabbi was walking home from the Temple and saw one of his good friends, a pious and learned man who could usually beat the rabbi in religious arguments.
The rabbi started walking faster so that he could catch up to his friend, when he was horrified to see his friend go into a non kosher Chinese restaurant. Standing at the door, he observed his friend talking to a waiter and gesturing at a menu. A short time later, the waiter reappeared carrying a platter full of spare ribs, shrimp in lobster sauce, crab rangoon and other treif that the Rabbi could not bear to think about.
It isn't the thing you do, friend, it's the thing you leave undone,