Telos

Telos (τέλος) is an ancient Greek term meaning end, purpose, goal, or completion. In Aristotelian philosophy, it represents the final cause—the purpose for which something exists or toward which it develops.

Aristotle argued that everything in nature has a telos. An acorn's telos is to become an oak tree; the eye's telos is to see; humanity's telos is eudaimonia (flourishing through virtuous rational activity). Understanding something requires knowing its purpose, not just its material composition or efficient cause.

This teleological worldview contrasts with modern mechanistic science, which explains phenomena through prior causes rather than purposes. Yet teleological thinking remains relevant in ethics, where understanding the good life requires considering human nature and purpose.

The concept raises profound questions: Do natural objects genuinely have purposes, or do we project them? Is there a cosmic telos, an ultimate purpose to existence? How do we discover our individual telos?

Teleological ethics (virtue ethics, natural law theory) grounds moral reasoning in human nature and proper human functioning. Understanding our telos—what we're "for"—guides decisions about how to live. This contrasts with rule-based ethics (deontology) or consequence-based ethics (consequentialism).