Erich Neumann
Author: Erich Neumann
Publisher: Princeton University Press (1954)

Common descent from the same tribe, the sharing of a common life, and, above all, common experiences create emotional bonds even today, as we well know.  Social, religious, aesthetic, and other collective experiences of whatever coloring - from the tribal head-hunt to the modern mass meeting - activate the unconscious emotional foundations of the group psyche.  The individual has not yet broken loose from the emotional undercurrent, and any excitation of one part of the group can affect the whole, as a fever seizes upon all parts of the organism.  The emotional fusion then sweeps away the still feebly developed differences of conscious structure in the individuals concerned and continually restores the original group unity.