What does this quote said by Hale mean? "The devil is precise; the marks of his presence are definite as stone."

The statement that Hale gives in Arthur Miller's The Crucible makes the point that he tries to make throughout the play. He is searching for verifiable proof of the Devil; however, throughout the play, Abigail and the other girls are making false accusations against everyone. Nothing can be proven--it is all hearsay. Hale, on the other hand, states that the Devil is precise and that his marks are as definite as stone, which means that if someone is influenced by the Devil, it will be clear and provable. There will be definitive marks and the accusations the girls are making have nothing definitive about them. Hale does believe that the Devil might control people, but he just thinks that the Devil will make his presence known with distinctive signs or marks.