Criticism — being mean, in a sense — can be fun. We seem to show off a bit of our mental acumen. “Good one!” people cheer on when someone makes a particularly wittily barbed comment. It’s what “the dozens” is all about. So giving up that potential scoring comment is a form of self-denial — a big idea in Catholicism.
Faber explains it better:
The practice of kind thoughts also tells most decisively on our spiritual life. It leads to great self-denial about our talents and influence. Criticism is an element in our reputation and an item in our influence. We partly attract persons to us by it. We partly push principles by means of it. The practice of kind thoughts commits us to the surrender of all this. It makes us, again and again in life, sacrifice successes at the moment they are within reach. Our conduct becomes a perpetual voluntary forfeiture of little triumphs, the necessary result of which is a very hidden life.
That seems to be a good definition of magnanimity.
The quoted excerpt is from Father Frederick Faber’s Spiritual Conferences, excerpted here.
The weakness of man, and the way in which he is at the mercy of external accidents in the world, has always been a favorite topic with the moralists. They have expatiated upon it with so much amplitude of rhetorical exaggeration, that it has at last produced in our minds a sense of unreality, against which we rebel. Man is no doubt very weak. He can only be passive in a thunderstorm, or run in an earthquake. The odds are against him when he is managing his ship in a hurricane, or when pestilence is raging in the house where he lives. Heat and cold, drought and rain, are his masters. He is weaker than an elephant, and subordinate to the east wind. This is all very true. Nevertheless man has considerable powers, considerable enough to leave him, as proprietor of this planet, in possession of at least as much comfortable jurisdiction, as most landed proprietors have in a free country. He has one power in particular, which is not sufficiently dwelt on, and with which we will at present occupy ourselves. It is the power of making the world happy, or at least of so greatly diminishing the amount of unhappiness in it, as to make it quite a different world from what it is at present. This power is called kindness. The worst kinds of unhappiness, as well as the greatest amount of it, come from our conduct to each other. If our conduct therefore were under the control of kindness, it would be nearly the opposite of what it is, and so the state of the world would be almost reversed. We are for the most part unhappy, because the world is an unkind world. But the world is only unkind for the lack of kindness in us units who compose it. Now if all this is but so much as half true, it is plainly worth our while to take some trouble to gain clear and definite notions of kindness. We practice more easily what we already know clearly.