TimV
Puritanboard Botanist
Sure, but Jesus says the reason why the OT 'allowed' for divorce, because of the 'hardness of your hearts'. He wasn't endorsing divorce, or saying that divorce is o.k. but it's not God's best plan, he was condemning divorce.
That doesn't make a whit of difference. The fact of the matter is that Piper is speculating as to what the audience thought at the time, and he's doing it without proper recourse to the Law.
So, we can either reinterpret the Matthean exception, one phrase found in the NT that seems to permit divorce, or we are forced to reinterpret the absolute condemnations of divorce throughout the NT and say, "Well, in light of the Matthean exception we know that these really can't be absolute condemnations."
Try to find out how many verses in the NT say you can't marry your sister. Why should the NT repeat everything in the OT? And the authors of the WCF knew that, and it figured in to their theology and guidelines.