Relating to witchcraft his job was to explain how it was even possible for demons to interact and interfere in human's lives. He did this by, "the careful step-by-step description of the nature of reality by constant reference to dogma and to other parts of his elaborately structured work." One explanation given by Aquinas in his search to give answers was that, "Some there were averred that such works as seem wonderful to us, being wrought by the magic art, are done, but by certain spiritual substances, but by the power of the heavenly bodies." So by saying this, in a way he is saying that this magic that everyone believes to be evil may not always be evil. This magic may be something given to a person by God as a good thing, not something given to a person by a demon, which is out to make people suffer. However later on Aquinas almost seems to say the opposite in another explanation of witchcraft. He says, "Now in these works of magicians, things appear that are exclusively the work of a rational nature; for instance, answers are given about stolen goods, and the like, and this could not be done .
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except by an intelligence. Therefore it is not true that all such effects are caused by the mere power of heavenly bodies." Aquinas almost contradicts his statement from before. He is saying that not all-magical events are done about by these heavenly bodies. They could be done about by a normal, rational, intelligent human being. However the point of this is not that he almost contradicts himself, but that it proves just how hard it was for the idea of witchcraft to be solved. The problem of witchcraft in the Middle Ages was placed as a burden on people like St. Thomas Aquinas' shoulders because he was a religious man. Everyone looked to him for answers because of that fact, not only that but because he was a philosopher who dealt with the conflict of God and Evilness.