For thousands of years it was believed that ghosts, good and bad, benevolent and malignant, weak and powerful, in some mysterious way, produced all phenomena; that disease and health, happiness and misery, fortune and misfortune, peace and war, life and death, success and failure, were but arrows from the quivers of these ghosts; that shadowy phantoms rewarded and punished mankind; that they were pleased and displeased by the actions of men; that they sent and withheld the snow, the light, and the rain; that they blessed the earth with harvests or cursed it with famine; that they fed or starved the children of men.