If 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. Nobody must rejoice in the security of their own good deeds. As long as we are still experiencing the uncertainties of this life, we do not know what end may follow...we must not trust in our own virtues.
-- Pope Saint Gregory the Great
