(a) Jealousy is unlawful in a mother who is vexed because her child loves his father as well as herself. The child ought to love both parents, and it is an evil jealousy that makes the mother grieve when the child does this.
(b) Jealousy is lawful in a wife who grieves because her husband gives to others the affection he promised would be hers alone. Scripture speaks of God Himself as jealous of the fidelity of His creatures, and declares that He will suffer no rival, but must have sole dominion over the heart (Josue, xxiv. 19 sqq.); and St. Paul tells the Corinthians that he is jealous of them, with the jealousy of God, because they have not been faithful to his preaching, but have been friendly to false teachers (II Cor., xi).
1334. Is grief at the prosperity of another a sin, when it is caused by fear of the harm he will do?
(a) If it is clear that the other will use his prosperity to act against justice or charity or the like, it is not a sin to grieve over the prosperity. For, since it is right to deprive a neighbor of the means of sinning when one has the power to do so, it is not wrong to wish that he lacked those means. Thus, it is not a sin to grieve over the election of an official who will promote lawbreakers and persecute the law-abiding: “When just men increase, the people shall rejoice; when the wicked shall bear rule, the people shall mourn” (Prov., xxix. 2). St. Gregory the Great declares that, as it is not uncharitable to rejoice at the downfall of an enemy, neither is it envious to be saddened at his success; since his downfall is a blessing to the oppressed, while his success means injustice to many.
(b) If it is clear that the other will use his power, wealth, or other goods to inflict evils that are deserved or not unjust, it is wrong to be sorry that he has the power, wealth, etc., just as it would be wrong to deprive him of them. Thus, it is wrong to grieve over the election of an honest official who will correct abuses and punish lawbreakers. It is not unlawful, however, for a lawbreaker to be sorry for himself at the prospect of the penalty he will receive.
(c) If it is uncertain whether the other will use his prosperity to do injury to oneself or to others, it is lawful to fear and to be on one’s guard, but it is not lawful to grieve unconditionally at the prosperity, just as it is not lawful in the circumstances to deprive the other of his prosperity.
1335. Is grief at the prosperity of another sinful, when it is caused by his unworthiness of prosperity? (a) If the indignation could be about spiritual things, of course it would be sinful; but this is not possible, for it is precisely spiritual goods (such as virtues) that make one deserving. Indignation, then, is about temporal goods, which are enjoyed by the bad, as well as the good. (b) If the indignation is about temporal things owned by the wicked, and one grieves that they have prosperity, sin is committed. For it is God who distributes to the undeserving the goods they have; His purpose is just, namely, that these goods may be for the correction or the punishment of the wicked; those who grieve over the prosperity of the unworthy overlook the fact that eternal goods are a reward to man, temporal goods only a trust to be administered. Hence, the Psalmist says: “Be not emulous of evil-doers, nor envy them that work iniquity, for they shall shortly wither away as grass” (Ps. xxxvi. 1).
1336. Two special cases of sorrow over the prosperity of the wicked must be considered. (a) If one sorrows precisely because the prosperity is had by an undeserving person, and is not thinking of the divine cause and purpose in human affairs, it does not seem that one sins; for, abstracting from Divine Providence, there does appear an unsuitability in the prosperity enjoyed by the wicked, and hence it is something to be sorry about. But such sorrow is at least a preparation for the sin spoken of in the previous paragraph, and so it should be shunned: “My feet were almost moved, my steps had well-nigh slipped, in anger at the wicked, seeing the prosperity of sinners” (Ps. lxxii. 2, 3). (b) If one sorrows precisely because the sinner will use his prosperity in such a way as to become more wicked and to incur chastisement, the sorrow is not uncharitable, but charitable.
1337. Sorrow at being surpassed by another on account of the relative loss of glory to self, with the wish that the other had not the good that makes him superior, is envy, as explained above. This sorrow is a sin. (a) Thus, it is condemned in scripture: “Let us not be made desirous of vainglory, envying one another” (Gal, v. 26); “The patriarchs through envy sold Joseph into Egypt” (Acts, vii. 9), “Charity envieth not” (I Cor., xiii. 4). (b) It is not reasonable to be grieved at the prosperity of others, since prosperity is something good and an object of joy rather than of sorrow.
1338. From its nature envy is a mortal sin. (a) Thus, it is directly opposed to the principal acts of charity, which are love of the neighbor, desire of his good, and joy over his prosperity; and charity is the life of the soul (I John, iii. 14). Secondary acts of charity, such as kissing the sores of a leper, may be omitted without loss of love, but envy destroys love itself. (b) Envy is directly contrary to mercy; for, while mercy grieves at the evil of others, envy grieves at their good. The envious are not merciful, neither are the merciful envious.