Aleister Crowley

Black magic is not a myth. It is a totally unscientific and emotional form of magic, but it does get results — of an extremely temporary nature. The recoil upon those who practice it is terrific.
It is like looking for an escape of gas with a lighted candle. As far as the search goes, there is little fear of failure!
To practice black magic you have to violate every principle of science, decency, and intelligence. You must be obsessed with an insane idea of the importance of the petty object of your wretched and selfish desires.
I have been accused of being a "black magician." No more foolish statement was ever made about me. I despise the thing to such an extent that I can hardly believe in the existence of people so debased and idiotic as to practice it.