, depicted here in the school of athens
, both developed philosophical arguments addressing the universe's apparent order (logos
teleology or finality is a reason or explanation for something as a function of its end, purpose, or goal. its name is derived from two greek words: telos (end, goal, purpose) and logos (reason, explanation). a purpose that is imposed by a human use, such as that of a fork, is called extrinsic. natural teleology, common in classical philosophy but controversial today, contends that natural entities also have intrinsic purposes, irrespective of human use or opinion. for instance, aristotle claimed that an acorn's intrinsic telos is to become a fully grown oak tree.
though ancient atomists rejected the notion of natural teleology, teleological accounts of non-personal or non-human nature were explored and often endorsed in ancient and medieval philosophies, but fell into disfavor during the modern era (1600–1900). in the late 18th century, immanuel kant used the concept of telos as a regulative principle in his critique of judgment. teleology was also fundamental to the philosophy of g. w. f. hegel.
contemporary philosophers and scientists are still discussing whether teleological axioms are useful or accurate in proposing modern philosophies and scientific theories. an example of the reintroduction of teleology into modern language is the notion of an attractor. for another instance in 2012, thomas nagel, who is not a biologist, proposed a non-darwinian account of evolution that incorporates impersonal and natural teleological laws to explain the existence of life, consciousness, rationality, and objective value. regardless, the accuracy can also be considered independently from the usefulness: it is a common experience in pedagogy that a minimum of apparent teleology can be useful in thinking about and explaining darwinian evolution even if there is no true teleology driving evolution. thus it is easier to say that evolution "gave" wolves sharp canine teeth because those teeth "serve the purpose of" predation regardless of whether there is an underlying nonteleologic reality in which evolution is not an actor with intentions. in other words, because human cognition and learning often rely on the narrative structure of stories (with actors, goals, and proximal rather than distal causation), some minimal level of teleology might be recognized as useful or at least tolerable for practical purposes even by people who reject its cosmologic accuracy. its accuracy is upheld by barrow and tippler in their 1986 treatise published by oxford university press "the anthropic cosmological principle". the citings of teleologists such as max plank and norbert wiener cannot be ignored in any truthful scientific endeavor.