In Chinese philosophy, the concept of yin-yang, which is often called "yin and yang", is used to describe how seemingly opposite or contrary forces are interconnected and interdependent in the natural world; and, how they give rise to each other as they interrelate to one another. Many natural dualities(such as male and female, light and dark, high and low, hot and cold, life& death, and so on) are thought of as physical manifestations of the yin-yang concept.
True magic is neither “black,” nor “white.” It is both, because Nature is both loving and cruel, all at the same time. The only “good” or “bad” is in the heart of the witch. Life keeps a balance on its own…“ — Lirio (the shopkeeper), The Craft