The old "Become who you are" has shaped the Western understanding of human development to this day. In depth psychology, C. G. Jung formulated this principle under the term "individuation" as a psychotherapeutic guideline, as well as a guide for a self-determined, authentic, yet highly relational life. The goal is the "unified and unique personality" (Jung). The book explains Jung's views, their developments, and their philosophical and scientific foundations in modern language.