The four causes or four explanations are, in Aristotelianism, categories of questions that explain "the why's" of something that exists or changes in nature. The four causes are the: material cause, the formal cause, the efficient cause, and the final cause. Aristotle wrote that "we do not have knowledge of a thing until we have grasped its why, that is to say, its cause."Aristotle, Physics 194 b17–20; see also Posterior Analytics 71 b9–11; 94 a20. While there are cases in which classifying a "cause" is difficult, or in which "causes" might merge, Aristotle held that his four "causes" provided an analytical scheme of general applicability.Lindberg, David. 1992. The Beginnings of Western Science. p. 53.
Aristotle's word aitia () has, in philosophical scholarly tradition, been translated as 'cause'. This peculiar, specialized, technical, usage of the word 'cause' is not that of everyday English language. Rather, the translation of Aristotle's αἰτία that is nearest to current ordinary language is "explanation."
In Physics II.3 and Metaphysics V.2, Aristotle holds that there are four kinds of answers to "why" questions:"Aristotle famously distinguishes four 'causes' (or causal factors in explanation), the matter, the form, the end, and the agent."
Hankinson, R. J. 1998. Cause and Explanation in Ancient Greek Thought. Oxford: Oxford University Press. p. 159. . .Aristotle. Metaphysics V, ( Aristotle in 23 Volumes, vols. 17–18), translated by H. Tredennick (1933/1989). London, William Heinemann Ltd. 1989 – via Perseus Project. § 1013a.
Aristotle discusses the four "causes" in his Physics, Book B, ch. 3.
The four "causes" are not mutually exclusive. For Aristotle, several, preferably four, answers to the question "why" have to be given to explain a phenomenon and especially the actual configuration of an object.According to Reece (2018): "Aristotle thinks that human action is a species of animal self-movement, and animal self-movement is a species of natural change. Natural changes, although they are not substances and do not have causes in precisely the same way that substances do, are to be explained in terms of the four causes, or as many of them as a given natural change has: The material cause is that out of which something comes to be, or what undergoes change from one state to another; the formal cause, what differentiates something from other things, and serves as a paradigm for its coming to be that thing; the efficient cause, the starting-point of change; the final cause, that for the sake of which something comes about." For example, if asking why a table is such and such, an explanation in terms of the four causes would sound like this: This table is solid and brown because it is made of wood (matter); it does not collapse because it has four legs of equal length (form); it is as it is because a carpenter made it, starting from a tree (agent); it has these dimensions because it is to be used by humans (end).
Aristotle distinguished between intrinsic and extrinsic causes. Matter and form are intrinsic causes because they deal directly with the object, whereas efficient and finality causes are said to be extrinsic because they are external.Aristotle, Metaphysica I. 983 a26 ss. As quoted in Battista Mondin (2022), Ontologia e Metafisica, 3rd ed., ESD, p. 157, .
Thomas Aquinas demonstrated that only those four types of causes can exist and no others. He also introduced a priority order according to which "matter is made perfect by the form, form is made perfect by the agent, and agent is made perfect by the finality."Thomas Aquinas, In IV Sententiarum, d. 3, q. 1, a. 1. sol. 1. As quoted in Battista Mondin (2022), Ontologia e metafisica, ESD, 2022, p. 158 Hence, the finality is the cause of causes or, equivalently, the queen of causes.Thomas Aquinas, Summa Theologiae I, q. 5, a. 2, ad. 1
About a century before Aristotle, the anonymous author of the Hippocratic text On Ancient Medicine had described the essential characteristics of a cause as it is considered in medicine:Lloyd, G. E. R. 1979. . Cambridge: Cambridge University Press. . .
We must, therefore, consider the causes of each medical condition to be those things which are such that, when they are present, the condition necessarily occurs, but when they change to another combination, it ceases.
Whereas modern physics looks to simple bodies, Aristotle's physics took a more general viewpoint, and treated living things as exemplary. Nevertheless, he argued that simple natural bodies such as earth, fire, air, and water also showed signs of having their own innate sources of motion, change, and rest. Fire, for example, carries things upwards, unless stopped from doing so. Things formed by human artifice, such as beds and cloaks, have no innate tendency to become beds or cloaks. Physics 192b
In traditional Aristotelian philosophical terminology, material is not the same as Substance theory. Matter has parallels with substance in so far as primary matter serves as the substratum for simple bodies which are not substance: sand and rock (mostly earth), rivers and seas (mostly water), atmosphere and wind (mostly air and then mostly fire below the moon). In this traditional terminology, 'substance' is a term of ontology, referring to really existing things; only individuals are said to be substances (subjects) in the primary sense. Secondary substance, in a different sense, also applies to man-made artifacts.
By Aristotle's own account, this is a difficult and controversial concept. It links with theories of forms such as those of Aristotle's teacher, Plato, but in Aristotle's own account (see his Metaphysics), he takes into account many previous writers who had expressed opinions about forms and ideas, but he shows how his own views differ from them.Lloyd, G. E. R. 1968. "The critic of Plato." pp. 43–47 in Aristotle: The Growth and Structure of His Thought. Cambridge: Cambridge University Press. .
Ernst Mayr. 1961. "Cause and Effect in Biology." Science 134(3489):1501–1506. . .
It is commonly recognised that Aristotle's conception of nature is teleological in the sense that Nature exhibits functionality in a more general sense than is exemplified in the purposes that humans have. Aristotle observed that a telos does not necessarily involve deliberation, intention, consciousness, or intelligence:Jonathan Barnes, ed. The Complete Works of Aristotle, vol. I. The Revised Oxford Translation.According to Aristotle, a seed has the eventual adult plant as its end (i.e., as its telos) if and only if the seed would become the adult plant under normal circumstances.Aristotle gives this example in Parts of Animals I.1. In Physics II.9, Aristotle hazards a few arguments that a determination of the end (i.e., final cause) of a phenomenon is more important than the others. He argues that the end is that which brings it about, so for example "if one defines the operation of sawing as being a certain kind of dividing, then this cannot come about unless the saw has teeth of a certain kind; and these cannot be unless it is of iron."Aristotle, Physics II.9. 200b4–7. According to Aristotle, once a final "cause" is in place, the material, efficient and formal "causes" follow by necessity. However, he recommends that the student of nature determine the other "causes" as well,Aristotle, Physics II.9. and notes that not all phenomena have an end, e.g., chance events. Physics II.5 where chance is opposed to nature, which he has already said acts for ends.
Aristotle saw that his biological investigations provided insights into the causes of things, especially into the final cause:
George Holmes Howison highlights "final causation" in presenting his theory of metaphysics, which he terms "personal idealism", and to which he invites not only man, but all (ideal) life:Howison, George Holmes. 1901. The Limits of Evolution. p. 39; and second edition, 1905, p.39
However, Edward Feser argues, in line with the Aristotelian and Thomism tradition, that finality has been greatly misunderstood. Indeed, without finality, efficient causality becomes inexplicable. Finality thus understood is not purpose but that end towards which a thing is ordered.cf. When a match is rubbed against the side of a matchbox, the effect is not the appearance of an elephant or the sounding of a drum, but fire. cf. The effect is not arbitrary because the match is ordered towards the end of fireCompare:The match is 'directed towards' the production of fire and heat ... which is realized through efficient causes.
In their biosemiotic study, Stuart Kauffman, Robert K. Logan et al. (2007) remark:
Thomas in this regard distinguished between causa fiendi (cause of occurring, of only beginning to be) and causa essendi (cause of being and also of beginning to be)The builder ( causa fiendi) and the materials of a house ( causa essendi) are examples. The house continues to exist even when the builder has ceased his work, which is why the latter is the necessary and sufficient cause of its beginning to be; but without the order and quality of the building materials, the house collapses, which is why these are necessary not only for its beginning to be, but also for its permanence in being ( causa essendi). When the being of the agent cause is in the effect in a lesser or equal degree, this is a causa fiendi.For example, parents who procreate a human or animal being with a degree of being equal to their own, i.e. a creature with the same rights and duties and ontological status (and a soul if it is a human creature). They are causa fiendi of the creature's mere beginning of life, which, in fact, once it has given birth and after a certain period of training for life, is capable of living even without its parents Furthermore, the second principle also establishes a qualitative link: the cause can only transmit its own essence to the effect. For example, a dog cannot transmit the essence of a feline to its young, but only that of a dog. The principle is equivalent to that of Causa aequat effectum (cause equals effect) in both a quantitative and qualitative sense.
In The New Organon, Bacon divides knowledge into physics and metaphysics:Bacon, Francis. 1620. The New Organon II, Aphorism 9.
From the two kinds of axioms which have been spoken of arises a just division of philosophy and the sciences, taking the received terms (which come nearest to express the thing) in a sense agreeable to my own views. Thus, let the investigation of forms, which are (in the eye of reason at least, and in their essential law) eternal and immutable, constitute Metaphysics; and let the investigation of the efficient cause, and of matter, and of the latent process, and the latent configuration (all of which have reference to the common and ordinary course of nature, not to her eternal and fundamental laws) constitute Physics. And to these let there be subordinate two practical divisions: to Physics, Mechanics; to Metaphysics, what (in a purer sense of the word) I call Magic, on account of the broadness of the ways it moves in, and its greater command over nature.
Contrary to Ayala's position, Ernst Mayr states that "adaptedness... is a posteriori result rather than an a priori goal-seeking."Ernst Mayr 1992. "The idea of teleology." Journal of the History of Ideas 53:117–135. Various commentators view the teleological phrases used in modern evolutionary biology as a type of shorthand. For example, S. H. P. Madrell writes that "the proper but cumbersome way of describing change by evolutionary adaptation may substituted by shorter overtly teleological statements" for the sake of saving space, but that this "should not be taken to imply that evolution proceeds by anything other than from mutations arising by chance, with those that impart an advantage being retained by natural selection."Madrell, S. H. P. 1998. "Why are there no insects in the open sea?" The Journal of Experimental Biology 201:2461–2464. However, Lennox states that in evolution as conceived by Darwin, it is true both that evolution is the result of mutations arising by chance and that evolution is teleological in nature.
Statements that a species does something "in order to" achieve survival are teleological. The validity or invalidity of such statements depends on the species and the intention of the writer as to the meaning of the phrase "in order to." Sometimes it is possible or useful to rewrite such sentences so as to avoid teleology. Some biology courses have incorporated exercises requiring students to rephrase such sentences so that they do not read teleologically. Nevertheless, biologists still frequently write in a way which can be read as implying teleology even if that is not the intention.
The four questions are on:Hladký, Vojtěch, and Jan Havlíček. 2013. " Was Tinbergen an Aristotelian? Comparison of Tinbergen's Four Whys and Aristotle's Four Causes." Human Ethology Bulletin 28(4):3–11.
Heidegger explains that "whoever builds a house or a ship or forges a sacrificial chalice reveals what is to be brought forth, according to the terms of the four modes of occasioning."
The Education David Waddington comments that although the efficient cause, which he identifies as "the craftsman," might be thought the most significant of the four, in his view each of Heidegger's four causes is "equally co-responsible" for producing a craft item, in Heidegger's terms "bringing forth" the thing into existence. Waddington cites Lovitt's description of this bringing forth as "a unified process."
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