The annotated RichardKennaway:
This is a quote from Henry IV part I, when Glendower is showing off to the other rebels, claiming to be a sorceror, and Hotspur is having none of it.
Glendower:
I can call spirits from the vasty deep.
Hotspur:
Why, so can I, or so can any man
But will they come when you do call for them?
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