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 PratchettWhut's the plan, Rob?" said one of them. "Okay, lads, this is what we'll do. As soon as we see somethin', we'll attack it. Right?" This caused a cheer. "Ach, 'tis a good plan," said Daft Wullie.
Terry PratchettI read the best works of some of the best satirists, and indeed best writers from the beginning of the Victorian era to about the 1960s. If you want to be a blacksmith, you go and watch the blacksmith working, and you work out what the blacksmith does.
Terry Pratchett