The miraculous gifts of the Spirit are no longer available. So if Grove is correct, and the gift of knowledge is necessary to understand the Lord's will, we are in big trouble. A terrifying fate awaits us all if we cannot even understand the Word by which we are going to be judged. Fortunately, the scriptures are sufficient and we can know what the Lord desires. The Bible is very clear about the marriage law.
Any sensible person can understand that verse.
The problem is, some people do not like the implications of the teaching. They try to concoct various ways around it, and confuse themselves. The same thing happens with the role of women in the worship. People may not like what that says, but they can understand it. Surely we must be able to comprehend what we study or the effort would be a waste and Paul would not have advised it.