We are continuing Paul’s discussion of how to love each other in the face of differences and disagreements. There are many things we can disagree about and easily live with the difference. My wife likes mysteries, I like historical novels. I like coffee, she likes tea. But those are just differences of preference and they in no way interfere with the peace and joy of our relationship.  
Disagreements over deeply held convictions are much more difficult. For instance, if a couple are deeply divided over the use of money, or the best way to discipline the children – as matters of personal conviction, those are really hard issues to navigate.  
But the hardest issues of all are matters of religious conviction and conscience. When the disagreement is about things we believe are sinful – that can be a real obstacle to peace.