Epilepsy occupies a distinctive position within the depth-psychology and allied neuroscientific corpus, functioning simultaneously as a clinical entity, a diagnostic boundary-marker, a window onto consciousness, and a figure of archaic religious significance. The corpus reveals at least four distinct registers in which the term operates. First, in the neurobiological literature — from Kandel’s channelopathy framework to James on corpus callosum surgery — epilepsy is treated as a model lesion-experiment illuminating hemispheric lateralization, memory localization, and the relationship between focal electrical discharge and subjective experience. Second, in Sacks, epilepsy becomes the vehicle for exploring the phenomenology of excess: ‘musical epilepsy’ forces the question of whether involuntary transport is pathology or heightened experience. Third, in Jung’s early experimental work and Bleuler’s differential diagnostics, epilepsy serves as a contrasting category against which schizophrenic and hysterical phenomena are distinguished — particularly regarding autism, automatism, and association patterns. Fourth, in Hillman and Plato’s Timaeus, the condition reaches its archaic root as the ‘sacred disease,’ linking nightmare, phlegm, bile, and demonic visitation. The tension between these registers — epilepsy as neurology, as phenomenology, as diagnostic foil, and as sacred affliction — gives the term its unusual depth within this library.