The Malleus Maleficarum (Latin for “The Hammer of Witches”, or “Hexenhammer” in German) is one of the most famous medieval treatises on witches. It was written in 1486 by Heinrich Kramer and Jacob Sprenger, and was first published in Germany in 1487. Its main purpose was to challenge all arguments against the existence of witchcraft and to instruct magistrates on how to identify, interrogate and convict witches. - Source
"But there is no bodily infirmity, not even leprosy or epilepsy, which cannot be caused by witches, with God's permission. And this is proved by the fact that no sort of infirmity is excepted by the Doctors. For a careful consideration of what has already been written concerning the power of devils and the wickedness of witches will show this statement offers no difficulty. Nider also deals with this subject in both his Book of Precepts and in his Formicarius, where he asks: Whether witches can actually injure men by their witchcraft. And the question makes no exception of any infirmity, however incurable. And he there answers that they can do so, and proceeds to ask in what way and by what means."
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