Aristotle
Across these works, Aristotle explains reality, natural change, virtue, and human flourishing through a linked set of logical, metaphysical, ethical, political, and poetic ideas.
Change is not random but a structured transition from potentiality to actuality, guided by the ultimate, unchanging source of motion known as the Unmoved Mover.
Every natural phenomenon and artifact can be comprehensively explained through its four causes, namely its physical matter, its defining form, the agent that produced it, and its ultimate purpose.
Moral virtue is not innate but developed through rigorous habituation, requiring a person to consistently choose the rational mean between the extremes of excess and deficiency.