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For Aristotle, the soul was the final cause because the soul guides all aspects of the psychological personality. He rejected Platonic dualism and believed the soul and body could not be nonmaterial and separate from the body. The rational soul reasoned in two basic ways: actively and passively. Passive reason operated in daily life from the perspective of survival. Passive reason had no interest in understanding the true essence of life. Active reason activated entelechy, which led to self-awareness and to the highest purpose of the immortal soul.