"In human nature, evil denotes only the polarity of matter and Spirit, a struggle of life between the two manifested Principles in Space and Time, which principles are one per se, inasmuch as they are rooted in the Absolute. In Kosmos, the equilibrium must be preserved. The operations of the two contraries produce harmony, like the centripetal and centrifugal forces which are necessary to each other - mutually inter-dependent - "in order that both should live". If one is arrested, the action of the other will become immediately self-destructive."
- Madame Blavatsky, The Secret Doctrine