In the third session of the conference, Dr. John Cox explores the complexities of dealing with difficult people in relationships, particularly in marriage. He emphasizes the importance of understanding the difference between repentant and unrepentant individuals, and how to engage with them effectively. The discussion covers strategies for setting limits, and the significance of addressing the style of communication rather than just the content. Ultimately, Dr. Cox provides practical insights and strategies for navigating these difficult dynamics, ultimately advocating for a redemptive approach to relationships.