From Aristotle to Darwin and Back Again

Darwin's theory of evolution remains controversial, even though most scientists, philosophers, and even theologians accept it, in some form, as an explanation for the variety of organisms. The controversy erupts when the theory is used to try to explain everything, including every aspect of human life, and to deny the role of a Creator or a purpose to life. The great philosopher and historian of philosophy, Étienne Gilson, sets out to show that final causality or purposiveness and formal causality are principles for those who think hard and carefully about the world, including the world of biology. Gilson insists that a completely rational understanding of organisms and biological systems requires the philosophical notion of teleology, the idea that certain kinds of things exist and have ends or purposes the fulfillment of which are linked to their natures--in other words, formal and final causes. His approach relies on philosophical reflection on the facts of science, not upon theology or an appeal to religious authorities such as the Church or the Bible.