“Considering the universal polarity rules of good and evil, active and passive, light and shadow, each science can serve good as well as bad purposes. Let us take the example of a knife, an object that virtually ought to be used for cutting bread only, which, however, can become a dangerous weapon in the hands of a murderer. All depends on the character of the individual. This principle goes just as well for all the spheres of the occult sciences.”

    Franz Bardon, Initiation into Hermetics