How Powerful is the Occult? Must Catholics be Wary?

A reader on Twitter recently sent me a message.  It was related to my current work on the prevalence and danger of the occult.  He said: "May I ask a question? How much power does the occult actually wield? I remember in the Old Testament it was either such practices do nothing or they use dark powers. Furthermore, how much does the average Catholic need to be wary? Say someone tries to cast a