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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.
These things are not a part of something nor are they in something else. These are primary substances. Primary substances are certain kinds of things. These species and the genera of these species are all secondary substances. For example, Aristotle is a human being â the kind of thing that Aristotle is. But human beings are a kind of animal. So human beings and animals are both secondary substances of Aristotle. This passage very clearly describes what primary substance and secondary substance refer to.