In Psychoanalysis and Personality, Joseph Nuttin bridges the gap between modern depth psychology and spiritual philosophy by integrating psychoanalytic findings with a Christian understanding of human existence. The book argues that classical Freudian psychoanalysis tends to provide a one-sided, pessimistic view of human nature by focusing heavily on repressed sexuality and pathology (the Oedipus complex). 

Rather than viewing normal personality as merely the absence of abnormality or neurosis, Nuttin presents a dynamic, existential approach. He redefines motivation, moving away from pure instinct toward a model centered on relational development, meaning-making, and self-actualization. He focuses on how internal tension, freedom, and human drives (such as religion and sexuality) actually function to build a healthy, integrated, and normal psyche.