The 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 Bible is a stream of running water, where alike the elephant may swim, and the lamb walk without losing its feet.
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 IIf we are, in fact, now occupied in good deeds, we should not attribute the strength with which we are doing them to ourselves. We must not count on ourselves, because even if we know what kind of person we are today, we do not know what we will be tomorrow.
Pope Gregory IThe 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 I