Why does Giles Corey say that his wife has been reading strange books?

Giles Corey suggests that his wife has been reading strange books because he believes it is related to witchcraft. This response is deeply rooted in the context of the Salem witch trials and the prevalent fears surrounding witchcraft during that time. In "The Crucible," characters like Giles are influenced by the superstitions and hysteria that grip the community. His fear of witchcraft reflects the societal panic that anything out of the ordinary could be associated with malevolent practices.

Giles' statement demonstrates how the community's paranoia about witchcraft leads to distrust and suspicion of one's neighbors, including his own wife. This concern encapsulates the broader theme of how fear can lead to tragic consequences, ultimately fueling the witch hunt atmosphere of the play. The accusation or implication that someone is involved with witchcraft could endanger not only that individual but also their loved ones, showcasing the destructive nature of such beliefs.