It is not surprising that
other portions of the play in which the sisters are mentioned should
confirm this view. Banquo, upon hearing the fulfilment of the prophecy
of the second witch, clearly expresses his opinion of the origin of the
"foreknowledge" he has received, in the exclamation, "What, can the
devil speak true?" For the devil most emphatically spoke through the
witches; but how could he in any sense be said to speak through Norns?
Again, Macbeth informs his wife that on his arrival at Forres, he made
inquiry into the amount of reliance that could be placed in the
utterances of the witches, "and learned by the perfectest report that
they had more in them than mortal knowledge."[1] This would be possible
enough if witches were the subjects of the investigation, for their
chief title to authority would rest upon the general opinion current in
the neighbourhood in which they dwelt; but how could such an inquiry be
carried out successfully in the case of Norns? It is noticeable, too,
that Macbeth knows exactly where to find the sisters when he wants them;
and when he says--
"More shall they speak; for now I am bent to know,
By the worst means, the worst,"[2]
he makes another clear allusion to the traffic of the witches with the
devil. After the events recorded in Act IV. sc. i., Macbeth speaks of
the prophecies upon which he relies as "the equivocation of the
fiend,"[3] and the prophets as "these juggling fiends;"[4] and with
reason--for he has seen and heard the very devils themselves, the
masters of the witches and sources of all their evil power.
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