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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 was an Greek philosopher. He also looked at the problem of causality. In his books Posterior analytics and Metaphysics he wrote: All causes are beginnings.... ... we have scientific knowledge when we know the cause.... ... to know a thing's nature is to know the reason why it is....