Nicomachean Ethics
The thoughts of Aristotle (384–322 BC) about self-love (philautia) are recorded in the Nicomachean Ethics and Eudemian Ethics. Nicomachean Ethics Book 9, Chapter 8 focuses on it particularly. In this passage, Aristotle argues that people who love themselves to achieve unwarranted personal gain are bad, but those who love themselves to achieve virtuous principles are the best sort of good. He says the former kind of self-love is much more common than the latter.