This question was taken from the Discourse with Mormons thread.
From Gospel Fundamentals p177
When a man and woman are sealed in the temple by someone who holds the priesthood and has special power to seal, their marriage will not end when they die. Their marriage will last forever if they keep the promises they made in the temple. This is called eternal marriage.
If a man and a woman are not sealed in the temple, the marriage ends when one of them dies. If we are sealed in the temple, and if we faithfully follow Jesus Christ to the end of our lives, our families can be together forever.
Matt 18:18 is one of the scriptures that they cite in support of this.
[quote=Andrew Larkoski] Christ clearly debunks this myth in the Gospels with the hypothetical situation given to him by Jewish elders about the woman with seven husbands, none of whom gave her any children. Then, in Ephesians, St. Paul speaks of marriage and the mystery, and how it is an analogy of Christ’s love of His Church. Finally, in Revalation, the First Marriage of Adam and Eve is linked to the final Marriage of the Bridegroom, Christ, and His Bride, the Church.
Catholics firmly believe that marriage is a sacrament, in other words, a gift from Jesus Christ. When we engage in sacraments, we glimpse the Glory of God in Heaven. But after we die, we are either in Heaven (or soon to be) or not, so there is no need for marrige of a man and wife anymore (there is no more need of an analogy of Heaven), for we are all (those in Heaven) married to Christ for all eternity.
This is something that no one has brought up yet, but, as I see it (and as Jesus taught) “eternal marriage” of man and wife is non-existent.
BTW, if eternal marriage does exist (I’ll play a Biblical Jewish Elder) who would a Mormon polygamist be married to in heaven? All of his wives? His favorite wife? None?
I thinking if plural marriage was legal and the Official Declaration #1 was overturned by some future LDS President acting as Prophet, then the Mormon male would have as his wife/wives in heaven, all those who have been sealed to him in a temple marriage, and have lived by all the tenets of the Mormon faith. How they square this away with Matt 22:23-30, I have no idea.