"The person must be blind, indeed, who can not see, that here on earth a great project, a great plan, is executed, may work on the realization of which we participate as faithful servants."

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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.

— Terry Pratchett