Besides Destiny the Shakespearean Drama admits direct supernatural agencies—witches, ghosts, apparitions, as well as portents and violations of natural law. It appears to me idle to contend that these in Shakespeare are not really supernatural, but must be interpreted as delusions of their victims. There may be single cases, such as the appearance of Banquo to Macbeth, where, as no eye sees it but his own, the apparition may be resolved into an hallucination. But to determine Shakespeare's general practice it is enough to point to the Ghost in Hamlet, which, as seen by three persons at once and on separate occasions, is indisputably objective: and a single instance is sufficient to establish the assumption in the Shakespearean Drama of supernatural beings with a real existence. Zeal for Shakespeare's rationality is a main source of the opposite view; but for the assumption of such supernatural existences the responsibility lies not with Shakespeare, but with the opinion of the age he is pourtraying. A more important question is how far Shakespeare uses such supernatural agency as a motive force in his plays; how far does he allow it to enter into the working of events, for the interpretation of which he is responsible? On this point Shakespeare's usage is clear and subtle: he uses the agency of the supernatural to intensify and to illuminate human action, not to determine it.
Intensifying human action.
Supernatural agency intensifying human action is illustrated in Macbeth. No one can seriously doubt the objective existence of the Witches in this play, or that they are endowed with superhuman sources of knowledge. But the question is, do they in reality turn Macbeth to crime? In one of the chapters devoted to this play I have dwelt on the importance of the point that Macbeth has been already meditating treason in his heart when he meets the Witches on the heath. His secret thoughts—which he betrays in his guilty start—i. iii. 51.have been an invitation to the powers of evil, and they have obeyed the summons: Macbeth has already ventured a descent, and they add an impulse downward. To bring this out the more clearly, Shakespeare keeps Banquo side by side with Macbeth through the critical stages of the temptation: Banquo has made no overtures to temptation, and to him the tempters have no mission. It is noticeable that where the two warriors meet the Witches on the heath it is Banquo who begins the conversation.
i. iii. 38-50.
Banquo. How far is 't called to Forres?
No answer. The silence attracts his attention to those he is addressing.
What are these
So wither'd and so wild in their attire,
That look not like the inhabitants o' the earth,
And yet are on 't?