These four ultimate concerns—death, freedom, isolation, and meaninglessness—constitute the corpus of existential psychodynamics. They play an extraordinarily important role at every level of individual psychic organization and have enormous relevance to clinical work.
Yalom’s foundational thesis identifies the four ultimate concerns as the structural core of existential psychodynamics, replacing drive-based models with awareness of existential boundary conditions as the origin of psychopathology.
, Existential Psychotherapy, 1980thesis