CNBC - May 10 - After 35 years of counseling married couples, Neil Clark Warren says he's learned that "if the right person doesn't marry the right person, you've got real problems ahead. When asked what the most important characteristic is in successful relationships, Warren tells CNBC that "Intelligence is really important" when it comes to matching people for marriage. Warren also says that over a 10-year period, the divorce rate of couples who met through eHarmony is 3.86%—far lower than a widely quoted statistic that half of all U.S. marriages end in divorce.