The show doesn't tell us a lot about how magic is done or why it works, but we know a few things.
Willow says somewhere, in Season 3 I think, that "it's a matter of emotional control."
Magic is addictive and dangerous to the person who practices it. Emphasized several times.
Magic always involves a price. Spike says this somewhere, and I don't think he's the only one.
And, in season 7, remember Willow draws power from Kennedy because she was "the most powerful person nearby." She says, "that's what I do," drawing power from people. I don't remember hearing much discussion in the fandom about that. It raises many disturbing questions. When Willow cast her spell to empower all the potential slayers, or when she intended to end the world, from whom did she draw the power? And what did it do to them?
Zhandele 23:52, November 22, 2009 (UTC)
Magic in the Buffyverse is a little convoluted in certain areas. Writers usually do what works for the episode. What is certain is that most magic has unexpected consequences when the caster is inexperienced, uncontrolled or undisciplined. Ther are also consequences for dark magic, usually thaumogenesis (creation of a demon), or accidentally drawing a demon from an alternate dimension.--Gonzalo84 05:36, November 24, 2009 (UTC)
Radical page restructuring
Okay, so my edit of this page was pretty big and had me removing more than adding, so I feel it's necessary to explain it. First of all, "god" need only be capitalized in the context that it's a proper noun, i.e. referring to the Judeo-Christian God. Secondly, The Powers That Be are not God. It's never even established if they're gods. Some of the page had to be radically restructured to clean up that mistake, but it's an important distinction to make. Buffy very specifically states that "the jury is still out" on whether or not God exists in Conversations with Dead People, and that was after she had been to what she herself termed as "Heaven".
Quote for Magic
I see we have the quote: It's magic i can tell. shouldn't we have a quote that says a little bit more about magic. what about the quote from General Voll and the doctor guy. "It's magic, general, you have to learn the rules." "there are no goddam rules." "that was kinda my point." something like that.