Found in a post on the Catholic Answers forums (forums.catholic.com)
I remember years ago Mother Angelica getting a call from a woman complaining about the issue of Hypocrisy. The woman told Mother Angelica, "I don't go to Mass because I don't want to be surrounded by all those hypocrites." Mother replied, "Don't worry there is always room for one more."
Or, in other words, "he who is without hypocrisy, let him cast the first stone."