Tough, strong, weak and fragile. Bullets, death, nuclear bombs, life, survival, and fresh air. War, peace, win and lose. Power, rich and even poor. These are natural laws of physics, nature and almost every religion. Pain hurts and pleasure feels good. Good and evil; a common thinker knows that one cannot exist without the other. The cycle is eternal. Negative energy attracts positive energy and positive energy attracts negative energy.