How penance and other corporal exercises are to be taken as instruments for arriving at virtue, and not as the principal affection of the soul; and of the light of discretion in various other modes and operations
“Wherefore she has trampled on the world, and placed it under the feet of her affection, despising it, and holding it vile, and thus becoming lord of it, holding it as folly. And the men of the world cannot take her virtues from such a soul, but all their persecutions increase her virtues and prove them, which virtues have been at first conceived by the virtue of love, as has been said, and then are proved on her neighbor, and bring forth their fruit on him. Thus have I shown you, that, if virtue were not visible and did not shine in the time of trial, it would not have been truly conceived; for, I have already told you, that perfect virtue cannot exist and give fruit except by means of the neighbor, even as a woman, who has conceived a child, if she do not bring it forth, so that it may appear before the eyes of men, deprives her husband of his fame of paternity.
It is the same with Me, who am the Spouse of the soul, if she do not produce the child of virtue, in the love of her neighbor, showing her child to him who is in need, both in general and in particular, as I have said to you before, so I declare now that, in truth, she has not conceived virtue at all; and this is also true of the vices, all of which are committed by means of the neighbor.”
Source: The Dialogue (CCEL)