Marriage causes joy or sorrow, causes happiness or heartache, brings peace or generates anger, and either nurtures or opposes spiritual development. Add to those truths these insights. Every good marriage can be better than it is. Every bad marriage can be worse than it is. Every good marriage has the potential of becoming a nightmare.
Every bad marriage has the potential of becoming a powerful blessing.
Only the Old Testament gives us details about specific marriages. The New Testament doesn't give details about specific marriages. That statement was often included in wedding ceremonies for three reasons. Isaac entered adult life and entered marriage with problems that began with his mother, Sarah. This was acceptable in that time.