William Graham Sumner,
Folkways
“ It is the ills of life which drive people to such deductions, and they bear witness to excessive nervous excitement. The mediæval dancing mania was more purely nervous. The demonism and demonology of the Middle Ages was a fertile source for such deductions, which went far to produce the witchcraft mania. The demonistic notions taught by the church furnished popular deductions, which the church took up and reduced to dogmatic form, and returned as such to the masses. Thus the notions of sorcery, heresy, and witchcraft were developed. ”
