1333. Rivalry is called jealousy, when it proceeds from a love so ardent that it wishes to have exclusive possession of the object loved. This jealousy is lawful or unlawful, according as the person who loves has or has not exclusive rights.

(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).