It is not long since the Haytian negroes looked on certain trees which had been hung with cloths as images of saints; and the Nubians see their gods in the grotesque forms of splintered rocks. The slightest cause predisposes the barbarian to terror; and from terror to superstition is but a short step. This last, which disappears before the logic and the sarcasm of civilized people, is the most important factor in the development of insanity. Ideler,[383] speaking of the Stockholm epidemic of 1842, mentions it as a historical fact that, in the places where the disease first appeared, people’s minds had for a long time past been disturbed and excited by sermons and devotional exercises; and that, in these places, the number of those affected had perceptibly increased. This is the explanation of ancient and modern prophets, and their sudden power which has left traces on the history of nations. Many unhappy persons affected by ambitious mania, or theomania, are looked upon as prophets, and their delusions taken for revelations; and this is the origin of a number of sects which have intensified the struggle between religion and liberty both in the Middle Ages and in modern times. Picard, for example, imagined himself to be a son of God, sent on earth as a new Adam, to re-establish the natural laws, which consisted, according to him, in going naked, and in the community of women. He met with believers and imitators, and founded the sect of the Adamites, who were exterminated by the Hussites in 1347, but were afterwards revived under the name of Turlupins. In the same way, the Anabaptists, at Münster, at Appenzell, and in Poland, believed that they saw luminous forms of angels and dragons fighting in the sky, that they received orders to kill their brothers or their best-beloved children (homicidal mania), or to abstain from food for months together, and that they could paralyze whole armies by their breath or by a look. Later on, those sects of Calvinists and Jansenists which caused the shedding of so much blood, had--as Calmeil has demonstrated--an analogous origin. This is also the origin of the belief in wizards and demoniacs.