Chance, Intelligibility, and the Watchmaker Argument
Among St. Thomas Aquinas’s Five Ways for demonstrating the existence of God, the Fifth Way—often called the argument from governance or finality—has frequently been conflated with what is popularly known as the “argument from design,” William Paley’s “watchmaker argument,” or modern forms of “intelligent design.” While these arguments share a family resemblance, Aquinas’s Fifth Way differs from them in method, metaphysical depth, and philosophical ambition. At its core, the Fifth Way is not an inference from complexity alone, but an argument from the intelligibility, regularity, and ordered directedness of nature toward an intellect that grounds and sustains that order. A careful comparison clarifies both the strengths of Aquinas’s approach and the limited, though pedagogically useful, role of the watchmaker analogy. The Fifth Way and the Governance of the World Aquinas’s Fifth Way begins with an observation about the natural world: non-rational beings consistently act for ends....