From a LifeSite interview:
LSN: An Italian exorcist, Father Sante Babolin, said recently that during an exorcism, the evil spirit that was tormenting the wife of one of his friends said to him: “I cannot bear that they love each other.” Is this not a message that married couples should meditate?
CB: Absolutely. There is no greater force against evil in the world than the love of a man and woman in marriage. After the Holy Eucharist, it has a power beyond anything that we can imagine....Surely it is true that whenever a couple has entered into marriage with all their mind and heart, the devil's going to be at work to try to spoil that home, because that home is a cradle of grace, where grace is received not only for the couple but for the children and for everyone who knows the family." - Cardinal Burke