The 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 the work of God could be comprehended by reason, it would no longer be wonderful, and faith would have no merit if reason provided proof.
Pope Gregory IBecause God that is immutable changes what He willed, He is said to repent, although what changes is a thing and not His counsel.
Pope Gregory IAs long as the vice of gluttony has a hold on a man, all that he has done valiantly is forfeited by him: and as long as the belly is unrestrained, all virtue comes to naught.
Pope Gregory I