Translating the nature of man in Ancient Greek

1. What is nature in Greek philosophy?
2. Who wrote on the nature of man?

What is nature in Greek philosophy?

Nature, according to Aristotle, is an inner principle of change and being at rest (Physics 2.1, 192b20–23). This means that when an entity moves or is at rest according to its nature reference to its nature may serve as an explanation of the event.

Who wrote on the nature of man?

1-2.