Aristotle‘s Nicomachean Ethics was something I reread and cannot recommend highly enough.
They say that Aristotle's works were translated first by the Arabs and then transferred back to Europe, after which they were translated back into Greek. It is interesting to think about the process of writing that drove the Arabs to create an Aristotle, to some extent, and we can sense the conceptualist truths of the Arabs to exist in this text, even though it might be really Aristotle to some extent. The secrets of Aristotle might be in here.