People in the 17th century believed in witches for three main reasons: 1. Unexplained illnesses or events were often attributed to witchcraft. For example, a woman testified that after refusing to give milk to Isabel, she became sick in ways she could not explain. 2. Superstitions led people to see witchcraft in everyday occurrences. A woman thought she saw fingers and a thumb pinch her thigh, and believed this was a sign of witchcraft. 3. Lack of scientific understanding allowed supernatural explanations to persist. Without knowledge of science or medicine, mysterious illnesses were more likely to be seen as the work of witches or demons.