Magic is a kind of energy. It is given shape by human thoughts and emotions, by imagination. Thoughts define that shapeโand words help to define those thoughts. Thatโs why wizards usually use words to help them with their spells. Words provide a sort of insulation as the energy of magic burns through a spell casterโs mind.
Jim ButcherLove is another kind of power, which shouldn't surprise you. Magic comes from emotions, among other things. And when two people are together, in that intimacy, when they really, selflessly love each other it changes them both. It lingers on in the energy of their lives, even when they are apart.
Jim Butcher