τελεολογία

Teleología was coined by Christian Wolff in 1728, from Greek telos (end, purpose, completion) and logos (study, account). But the concept goes back to Aristotle, who argued that understanding anything requires knowing its final cause — its telos, what it is for. An acorn's telos is to become an oak. An eye's telos is to see. For Aristotle, nature is full of purposes. This was not metaphor. He meant it literally.

The mechanical philosophy of the seventeenth century attacked teleology. Descartes, Galileo, and Newton explained motion through efficient causes — forces and impacts — not purposes. Spinoza declared that teleology was a human projection: people imagine nature has purposes because they themselves have purposes. Francis Bacon called final causes 'barren virgins' that produce no knowledge. By the Enlightenment, teleology looked like a medieval holdover.

Darwin complicated the picture in 1859. Natural selection produces organisms that look designed — eyes, wings, immune systems — without any designer or purpose. The heart pumps blood, but it was not made to pump blood. It pumps blood because ancestors whose hearts pumped blood survived. Biologists began using teleological language ('the function of the heart is...') while insisting they did not mean it teleologically. The distinction between 'function' and 'purpose' became philosophically important.

Teleological thinking persists in everyday life. People ask what things are for — what is the purpose of suffering, what is the meaning of life, what is this tool designed to do. The question 'why?' almost always seeks a telos. Scientists avoid teleological language in print and use it constantly in conversation. The human mind, it turns out, is wired for teleological explanation. Whether the universe cooperates is another question.