'Since it is often the case that when a sermon is delivered in accordance with a high standard, the soul of the speaker is inflated by the hidden joys of self-display, therefore it is necessary that great care be taken so that he might feel the sting of fearful conscience. Otherwise, the one who is able to return others to health will ignore himself and develop the swelling of pride. Let him not abandon himself by helping others or stumble as he enables others to rise. Unfortunately, there are some for whom the greatness of their virtue has become the occasion for their perdition because they were foolishly secure in the confidence of their strength and then died unexpectedly through negligence. For when virtue resists the vices, the soul is gratified. But in doing so, the mind of the one who does these good things ignores fear and circumspection and instead, rests secure in self-confidence.'
Gregory the Great, Book of Pastoral Rule, p.209.
