3 What then is the virtue of a horse? Is it to have a bridle studded with gold and girths to match, and a band of silken threads to fasten the housing, and clothes wrought in various colours and gold tissue, and head gear studded with jewels, and locks of hair plaited with gold cord? Or is it to be swift and strong in its legs, and even in its paces, and to have hoofs suitable to a well bred horse, and courage fitted for long journies and warfare, and to be able to behave with calmness in the battle field, and if a rout takes place to save its rider?
Is it not manifest that these are the things which constitute the virtue of the horse, not the others? Again, what should you say was the virtue of asses and mules? Is it not the power of carrying burdens with contentment, and accomplishing journies with ease, and having hoofs like rock? Shall we say that their outside trappings contribute anything to their own proper virtue? By no means. And what kind of vine shall we admire? One which abounds in leaves and branches, or one which is laden with fruit?
Or what kind of virtue do we predicate of an olive? Is it to have large boughs, and great luxuriance of leaves, or to exhibit an abundance of its proper fruit dispersed over all parts of the tree? Well, let us act in the same way in the case of human beings also: let us determine what is the virtue of man, and let us regard that alone as an injury, which is destructive to it. What then is the virtue of man? Not riches that you should fear poverty: nor health of body that you should dread sickness, nor the opinion of the public, that you should view an evil reputation with alarm, nor life simply for its own sake, that death should be terrible to you: nor liberty that you should avoid servitude: but carefulness in holding true doctrine, and rectitude in life.
Of these things not even the devil himself will be able to rob a man, if he who possesses them guards them with the needful carefulness: and that most malicious and ferocious demon is aware of this. For this cause also he robbed Job of his substance, not to make him poor, but that he might force him into uttering some blasphemous speech; and he tortured his body, not to subject him to infirmity, but to upset the virtue of his soul. But nevertheless when he had set all his devices in motion, and turned him from a rich man into a poor one (that calamity which seems to us the most terrible of all), and had made him childless who was once surrounded by many children, and had scarified his whole body more cruelly than the executioners do in the public tribunals (for their nails do not lacerate the sides of those who fall into their hands so severely as the gnawing of the worms lacerated his body), and when he had fastened a bad reputation upon him (for Job's friends who were present with him said “you have not received the chastisement which your sins deserve,” and directed many words of accusation against him), and after he had not merely expelled him from city and home and transferred him to another city, but had actually made the dunghill serve as his home and city; after all this, he not only did him no damage but rendered him more glorious by the designs which he formed against him. And he not only failed to rob him of any of his possessions although he had robbed him of so many things, but he even increased the wealth of his virtue. For after these things he enjoyed greater confidence inasmuch as he had contended in a more severe contest. Now if he who underwent such sufferings, and this not at the hand of man, but at the hand of the devil who is more wicked than all men, sustained no injury, which of those persons who say such and such a man injured and damaged me will have any defence to make in future? For if the devil who is full of such great malice, after having set all his instruments in motion, and discharged all his weapons, and poured out all the evils incident to man, in a superlative degree upon the family and the person of that righteous man nevertheless did him no injury, but as I was saying rather profited him: how shall certain be able to accuse such and such a man alleging that they have suffered injury at their hands, not at their own?
Source: No One Can Harm the Man Who Does Not Injure Himself (New Advent)