PCRT Q/A: Biblical Grounds for Divorce

We are having a great PCRT in Grand Rapids this weekend.  Our speakers Iain Duguid, David Garner, and David Murray have been terrific on our theme of Holiness and Honor: A Reformed View of Marriage and Sex.  We also had an insightful Q&A session.  Unfortunately, it was way too short to get to even a majority of the questions.  Therefore, I promised to tackle them here on Ref21 in the upcoming days.  So here goes with the first question for the PCRT Q&A leftovers: