“Virtually everything depends on the human psyche and its functions. It should be worthy of all the attention we can give it, especially today, when everyone admits that the weal or woe of the future will be decided neither by the threat of wild animals, nor by natural catastrophes, nor by the danger of world-wide epidemics, but simply and solely by the psychic changes in man. It needs only an almost imperceptible disturbance of equilibrium in a few of our rulers’ heads to plunge the world into blood, fire, and radioactivity.”