I never said that marriage being made a sacrament changes that people in Heaven neither marry nor are given in marriage. What I was saying is that the Sadducees were not discussing Christian, sacramental marriage with Jesus. The marriage that was being discussed (peripherally, as they were really attempting to engage Jesus in a debate about the resurrection of the body) was the ancient Jewish levirate marriage. As such, I see no reason to attempt to base Christian teaching on marriage based on this passage, except for the part about whether people marry in Heaven. Having said that, there is a biblical basis for the lawfulness of the second marriage of those who are widowed-it’s just not to be found in this passage. Rather, it is to be found in 1 Corinthians 7:8-9, 39-40. However, even in this passage, St. Paul teaches that it is better for the widow not to remarry, but that the remarriage is preferable than it is to burn (with passion). This is the basis for the Orthodox teaching that second marriages are penitential and are granted as a concession to human weakness.