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Quick Answer. In Aristotle's ethical work, Nicomachean Ethics, he describes human nature as having rational and irrational psyches as well as a natural drive for creating society, gaining knowledge, finding happiness and feeling connected with God.
In the fourth century B. C., the Greek philosopher Aristotle identified the heart as the most important organ of the body, the first to form according to his observations of chick embryos. It was the seat of intelligence, motion, and sensation -- a hot, dry organ. Aristotle described it as a three-chambered organ that was the center of vitality in the body. Other organs surrounding it (e.g. brain and lungs) simply existed to cool the heart.