The highest function of love is that it makes the loved one a unique and irreplaceable being. Still, lovers quarrel. Frequently, they quarrel simply to recharge the air between them, to sharpen the aliveness of their relationship. To precipitate such a quarrel, the sweaty kimono of sexual jealousy is usually dragged out of the hamper, although almost any excuse will do. Only rarely is the spat rooted in the beet-deep soil of serious issue, but when it is, a special sadness attends it, for the mind is slower to heal than the heart, and such quarrels can doom a union, even one that has prospered for a very long time.