Terry Pratchett Quotes
It's an old magical principle - it's even filtered down into RPG systems - that magic, while taking a lot of effort, can be 'stored' - in a staff, for example. No doubt a wizard spends a little time each day charging up his staff, although you go blind if you do it too much, of course.
Citations
Pratchett, Terry. Post to alt.fan.pratchett. Usenet, 1993.
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Sir Terence David John Pratchett OBE was an English humorist, satirist, and author of fantasy novels, especially comical works. He is best known for his Discworld series of 41 novels.