. . .marriages are more likely to last when the man and woman enter into it thinking the marriage is forever. . . . "People who believed [that the marriage was forever] seemed to have the happiest marriages, perhaps because they were more willing to work though their problems in a lifelong effort to fulfill their own expectations."They also found that the amount you squabble with your spouse now, will probably be about the same in 20, or however many years!
The study was based on interviews with 2,000 married people over the course of 20 years!