According to Luther, fair and foul winds were caused by good and evil spirits. He spoke of a terrible lake in Switzerland, haunted by the Devil, and said there was a similar one in his own country. If a stone was thrown into it, a frightful storm shook the whole locality. The Devil made people idiots, cripples, blind, deaf and dumb; and Luther declared that the doctors who treated such infirmities as natural had a great deal to learn in demonology. One or two of his stories of possession are extremely gruesome. With his own lusty love of life, Luther could not understand suicide, so he attributed that also to the Devil. Satan made the suicides think they were doing something else; even praying, and thus he killed them. Brother Martin, indeed, sometimes feared the Devil would twist his neck or press his skull into his brains. Nor did he shrink from the darkest developments of this superstition. He held that the Devil could assume the form of a man or a woman, cohabit with human beings of the opposite sex, and become a father or a mother. "Eight years ago," said Luther, "I saw and touched myself at Dessau a child who had no parents, and was born of the Devil. He was twelve years old, and shaped like an ordinary child. He did nothing but eat, and ate as much as three peasants or threshers. When he was touched he cried out like one possessed; if any unfortunate accident happened in the house, he rejoiced and laughed; if, on the contrary, all went well, he wept continually. I said to the princes of Anhalt, with whom I then was: If I commanded here I would have that child thrown into the Moldau, at the risk of being its murderer. But the Elector of Saxony and the princes were not of my opinion."