How is it possible that suffering that is neither my own nor of my concern should immediately affect me as though it were my own, and with such force that it moves me to action?... This is something really mysterious, something for which Reason can provide no explanation
Campbell foregrounds Schopenhauer's foundational question about Mitleid as the irreducible mystery at the heart of moral action, establishing compassion as a phenomenon that exceeds rational justification.
, Thou Art That: Transforming Religious Metaphor, 2001thesis