Jim Butcher said this quote
“ Magic comes from the heart, from your feelings, your deepest expressions of desire. That's why black magic is so easy—it comes from lust, from fear and anger, from things that are easy to feed and make grow. The sort I do is harder. It comes from something deeper than that, a truer and purer source—harder to tap, harder to keep, but ultimately more elegant, more powerful. My magic. That was at the heart of me. It was a manifestation of what I believed, what I lived. It came from my desire to see to it that someone stood between the darkness and the people it would devour. It came from my love of a good steak, from the way I would sometimes cry at a good movie or a moving symphony. From my life. From the hope that I could make things better for someone else, if not always for me. Somewhere, in all of that, I touched on something that wasn't tapped out, in spite of how horrible the past days had been, something that hadn't gone cold and numb inside of me. I grasped it, held it in my hand like a firefly, and willed its energy out, into the circle I had created with the spinning amulet on the end of its chain. ”