They are to be admonished to consider that commonly the life of the continent is put to shame by the action of secular persons, when the latter take on themselves works beyond their condition, and the former do not stir up their hearts to the mark of their own order. Whence it is well said through the Prophet, Be ashamed, O Sidon, says the sea. For Sidon is as it were brought to shame by the voice of the sea, when the life of him who is fortified, and as it were steadfast, is reproved by comparison with the life at those who are secular and fluctuating in this world.
For often there are some who, returning to the Lord after sins of the flesh, show themselves the more ardent in good works as they see themselves the more liable to condemnation for bad ones: and often certain of those who persevere in purity of the flesh seeing that they have less in the past to deplore, think that the innocency of their life is fully sufficient for them, and inflame themselves with no incitements of ardour to fervour of spirit. And for the most part a life burning with love after sin becomes more pleasing to God than innocence growing torpid in security.
Whence also it is said by the voice of the Judge, Her sins which are many are forgiven, for she loved much; and, Joy shall be in heaven over one sinner that repents more than over ninety and nine just persons which need no repentance. Which thing we the sooner gather from experience itself, if we weigh the judgments of our own mind. For we love the land which produces abundant fruit after thorns have been ploughed out of it more than that which has had no thorns, but which, when cultivated, yields a barren harvest.
Those who know not the sins of the flesh are to be admonished not to prefer themselves to others for the loftiness of their superior order, while they know not how great things are done by their inferiors better than by themselves. For in the inquisition of the righteous judge the quality of actions changes the merits of orders. For who, considering the very outward appearance of things, can be ignorant that in the nature of gems the carbuncle is preferred to the jacinth? But still a jacinth of cerulean colour is preferred to a pale carbuncle; because to the former its show of beauty supplies what the order of nature denied it, and the latter, which natural order had preferred, is debased by the quality of its colour.
Thus, then, in the human race both some in the better order are the worse, and some in the worse order are the better; since these by good living transcend the lot of their lower state, and those lessen the merit of their higher place by not coming up to it in their behaviour.
Source: Pastoral Rule (New Advent)