The people will have no need to change their place of concourse; where of old they were wont to sacrifice cattle to demons, thither let them continue to resort on the day of the Saint to whom the Church is dedicated, and slay their beasts, no longer as a sacrifice to demons, but for a social meal in honour of Him whom they now worship.
Pope Gregory IThe holy universal Church teaches that it is not possible to worship God truly except in Her and asserts that all who are outside of Her will not be saved.
Pope Gregory IThe pastor should always be pure in thought ... no impurity ought to pollute him who has undertaken the office of wiping away the stains in the hearts of others ... for the hand that would cleanse from dirt must be clean, lest, being itself sordid with clinging mire, it soil whatever it touches all the more.
Pope Gregory I