“I consider the puer aeternus attitude an unavoidable evil. Identity with the puer signifies a psychological puerility that could do nothing better than outgrow itself. It always leads to external blows of fate which show the need for another attitude. But reason accomplishes nothing, because the puer aeternus is always an agent of destiny.”
Von Franz, citing Jung directly, frames the puer aeternus as a pathological identification that resists rational correction and must be dissolved through the pressure of fate itself.
, Puer Aeternus: A Psychological Study of the Adult Struggle with the Paradise of Childhood, 1970thesis