The Nicomachean Ethics by Aristotle, with supplementary watching of lectures. I like how thorough Aristotle discusses things, and how grounded they were. For example, I think he had said that a singular action does not make someone "virtuous" or "vicious", but those label depend on whether an act was done consciouly or unconsciously, internal reactions and habits. Also, him discussing the difference between "particular knowledge" and "universal knowledge" felt like it made sense to me, but that's probably because I'm neurodivergent, lol.

With the lectures (which I wouldn't have watched without reading the book) my mind was sorta blown by a question whether "Intent", "The Person", and the "Consequences" was the most important, because a lot of the people interested in philosophy these days usually like to elevate only one aspect to importance. But as it stands, all of them are important.

Reading the book I also thought, since I am so interested in Philosophy and literally watch lectures for it, and Mathematics was valued and often used as a sort of illustrative point for their concepts, perhaps I should study Mathematics more thoroughly, starting from its philosophical roots? I literally suck at it. I think it would do me well to go beyond just using the mathematical formulas and try to understand it fundamentally.