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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.
Aristotle believed that all bodies are made up of four elements: earth, water, air and fire (see Fig. 2.7). These elements naturally move up or down, fire being the lightest and earth the heaviest. A composite object will have the features of the element which dominates; most things are of this sort.