But it ought to be known, that there are some, whom mother Church tolerates, nursing them in the bosom of charity, and whom she would carry on even to the advanced growth of spiritual age, who sometimes both wear the garb of sanctity, and yet cannot attain to the merit of perfection. For they rise not to spiritual gifts, and therefore they assist those who are connected with them, in the preservation of earthly goods, and sometimes transgress in anger in this defence. But we must not believe that these persons fall into the numbers of hypocrites, for it is one thing to sin from infirmity, and another from wickedness. There is therefore this difference between these persons and hypocrites, that these, conscious of their own infirmity, prefer being reproved by all for their faults, to being praised for pretended sanctity. But those are both sure that they are doing wrong, and yet in the judgments of men are puffed up with the name of sanctity. These fear not to displease wicked men, even by a virtuous action, provided only they are approved by the judgments of heaven; but those never consider what they are doing, but how by every action they can please men. These, according to the measure of their understanding, contend for the causes of God, even in things of the world; but those subserve the design of the world, even in the causes of God; because in the very midst of the holy deeds they make a shew of doing, they seek not the conversion of men, but the breath of applause.
When therefore we behold any persons of no mean conversation defending worldly interests passionately or immoderately, we ought to reprove this fault of theirs charitably, and yet not to despair of them, while reproving them. Because there frequently exist in one and the same person certain censurable points which are apparent, and great qualities which lie concealed. But in ourselves our great qualities often come forth openly, and those which are reprehensible are sometimes concealed. Hence, therefore, our pride of mind must be brought low, because, both their weaknesses are public, and ours are secret: and again, their strong points are concealed, and ours are divulged and made public. Those therefore, whom we blame for their open weakness, it remains for us to venerate from our opinion of their hidden strength, and if our own mind is elated at their open weakness, let it keep itself down in humility, from considering its own secret infirmities. For some persons frequently obey many precepts, and pass over a few; and we pass over many, when we keep but a few. Whence it is frequently the case that, when we see others neglect a command, which we know we observe ourselves, our mind immediately exalts itself with pride, forgetting how many commands it passes over, when there are very few which it observes. It is therefore necessary for us in cases where we reprove others, to bring down the pride of our anxious thought. For if our mind sees that it is more exalted than others, being led, as it were, to headlong heights of singularity, it falls the more fatally. But why the hypocrite abandons heavenly lucre, and labours for that of earth, He still subjoins, under the description of the ostrich, saying: Ver. 17. God hath deprived her of wisdom, neither hath He given her understanding.
St. Gregory the Great, Moralia, Book XXXI, sections 24 & 25
