Take a moment and think about each of them and how they relate to your relationships. Arguments are caused by a failure to successfully discuss and resolve issues and disagreements. Discussions and arguments are not the same - they are opposites. Discussions have a tendency to degenerate into arguments- even when we don't want them to. Anger, frustration, misunderstanding and ignorance increase this tendency.
Arguments ruin relationships by turning lovers into enemies.
Discussions save relationships by resolving problems that threaten them. Couples can learn how to discuss issues, and in doing so, learn how to resolve problems without arguing. They therefore fear and avoid the discussion of issues. They therefore attempt to get couples to raise issues but inadvertently precipitate arguments. Arguments in the presence of a therapist are just as unlikely to result in the resolution of an issue as those held without one.