The simplest decision model with only two alternatives, is known as Manicheanism, which is adapted by Zarathustra and then taken by other organised religions. Manicheanism is the duality concept, which divides everything in the world into discrete either/or and opposite polar, such as good and evil, black and white, night and day, mind (or soul) and body, etc. This duality concept was a sufficient model of reality for those old days in order to make their world manageable and calculable. However, nowadays we know it well that everything is becoming and has a wide continuous spectrum.