: He viewed human life through the lens of reincarnation, suggesting that our "fate" is not a series of random events but a structured learning process for the soul.

: Dethlefsen believed the human experience is defined by polarity (good/evil, health/sickness). True healing involves moving toward "wholeness" by integrating these opposites rather than fighting one side.

Dethlefsen’s work is centered on the intersection of ancient esoteric wisdom and modern psychology. His core teachings include:

: He argued that symptoms are "bodily expressions of inner conflicts". In his view, a symptom is a "teacher" that forces an individual to confront "shadow" aspects—parts of the self they have repressed or ignored.