Harville Hendrix and Helen LaKelly Hunt open with their central 'imago' theory: people unconsciously select romantic partners who resemble a composite image of their early primary caregivers, including both positive and negative traits, in an unconscious attempt to heal childhood wounds.

Why this unconscious selection pattern matters:

• This theory explains why people often find themselves repeatedly attracted to partners sharing similar problematic traits, despite consciously wanting to avoid these patterns
• Understanding this unconscious mechanism provides insight into recurring relationship conflict patterns that might otherwise seem simply coincidental or purely due to partner selection
• This framework provides the foundation for the book's subsequent therapeutic approach to addressing these unconscious patterns within existing relationships

This opening establishes the book's foundational psychological theory, providing the conceptual framework for its subsequent relationship therapy approach.