I think there's probably always been visions and voices, and these were variously ascribed to the divine or demonic or the muses. I think many poets still feel they depend on an inner voice, or a voice which tells them what to do.
Oliver SacksIf migraine patients have a common and legitimate second complaint besides their migraines, it is that they have not been listened to by physicians. Looked at, investigated, drugged, charged, but not listened to.
Oliver SacksThe power of music to integrate and cure. . . is quite fundamental. It is the profoundest nonchemical medication.
Oliver Sacks