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Aristotle (sculpture)
Aristotle (sculpture)

Aristotle (Greek: Αριστοτέλης Aristotelēs) (384 BCMarch 7, 322 BC) was an ancient Greek philosopher. Along with Plato, he is often considered to be one of the two most influential philosophers in Western thought. He wrote many books about physics, poetry, zoology, government, and biology.



The three greatest ancient Greek philosophers were Aristotle, Plato (a teacher of Aristotle) and Socrates (c. 470-399 BC), whose thinking deeply influenced Plato. Among them they transformed presocratic Greek philosophy into the foundations of Western philosophy as we know it. Socrates did not leave any writings, possibly as a result of the reasons articulated against writing philosophy attributed to him in Plato's dialogue Phaedrus. His ideas are therefore known to us only indirectly, through Plato and a few other writers. The writings of Plato and Aristotle form the core of Ancient philosophy.

Their works, although connected in many fundamental ways, are very different in both style and substance. Plato mainly wrote philosophical dialogues, that is, arguments in the form of conversations, usually with Socrates as a participant. Though the early dialogues are concerned mainly with methods of acquiring knowledge and most of the last ones with justice and practical ethics, his most famous works expressed a synoptic view of ethics, metaphysics, reason, knowledge and human life. The fundamental idea is that knowledge gained through the senses is always confused and impure, true knowledge being acquired by the contemplative soul that turns away from the world. To attain such true knowledge, the philosopher must make use of the "royal science" of dialectic. One of the necessary obstacles of dialectic is dialogue itself which guides the interlocutors away from the paths to truth. The soul alone can have knowledge of the Forms, the real essences of things, of which the world we see is but an imperfect copy. Such knowledge has ethical as well as scientific importance. Plato can be called, with qualification, an idealist and a rationalist.

Aristotle, by contrast, placed much more value on knowledge gained from the senses and would correspondingly be better classed among modern empiricists (see materialism and empiricism). He also achieved a "grounding" of dialectic in the Topics by allowing interlocutors to begin from commonly held beliefs Endoxa; His goal being non-contradiction rather than Truth. He set the stage for what would eventually develop into the scientific method centuries later. Although he wrote dialogues early in his career, no more than fragments of these have survived. The works of Aristotle that still exist today are in treatise form and were, for the most part, unpublished texts. These were probably lecture notes or texts used by his students, and were almost certainly revised repeatedly over the course of years. As a result, these works tend to be eclectic, dense and difficult to read. Among the most important ones are Physics, Metaphysics, Nicomachean Ethics, Politics, De Anima (On the Soul) and Poetics.

Aristotle is known for being one of the few figures in history who studied almost every subject possible at the time. In science, Aristotle studied anatomy, astronomy, embryology, geography, geology, meteorology, physics,and zoology. In philosophy, Aristotle wrote on aesthetics, economics, ethics, government, metaphysics, politics, psychology, rhetoric and theology. He also dealt with education, foreign customs, literature and poetry. His combined works practically comprise an encyclopedia of Greek knowledge.

History and influence of Aristotle's work

Aristotle (with the features of ) depicted by  holding his Ethics: detail from the   , 1510 – 1511
Aristotle (with the features of Bramante) depicted by Raphael holding his Ethics: detail from the Vatican fresco The School of Athens, 1510 – 1511

The history of Aristotle's works from the time of his death until the 1st century BC is obscure. Legend has it that Aristotle's personal library, including the manuscripts of his works, was left to his successor Theophrastus and was later hidden to avoid confiscation or destruction; finally, the manuscripts were rediscovered in 70 BC. Andronicus of Rhodes then edited and published the works. In the interim, however, the works could hardly have been forgotten, since Aristotle's school, the Lyceum, was in operation the whole time.

The majority of Aristotle's work has been lost, some since Classical times. There is a glimpse of what we have lost in the praise given by Cicero to the eloquence of Aristotle's dialogues. The surviving works are known and respected for a plain and unadorned (though not easy) style; not one is a dialogue. Some lost works of Aristotle may have survived in hard-to-restore carbonised form at the Villa of the Papyri in Herculaneum, currently under excavation.

In late antiquity Aristotle fell nearly out of sight. Early Christian writers such as Tertullian rejected philosophy altogether as a pagan study that was made obsolete by the Gospels. In the 5th century Saint Augustine used Platonic and Neo-Platonic philosophy in his theology, but had no use for Aristotle. At the end of the century, however, Boethius undertook to translate the works of Aristotle and other Greeks into Latin, as the teaching of Greek was being lost in the West; his translations and commentaries were nearly all that was known of Greek philosophy in the West for several centuries. They were little missed, as the hostility of early Christianity to pagan philosophy continued.

Aristotle's works were read during the Umayyad and Abbasid caliphates, however, and the Islamic philosopher Averroes commented extensively on it and attempted to fuse it with Islamic theology. Maimonides also tried this with Judaism. By the 12th century there was a great revival of interest in Aristotle in Christian Europe, and the great translator William of Moerbeke worked from both Greek and Arabic manuscripts to produce Latin translations. Aristotle's works were commented on by Thomas Aquinas and became the standard philosophical approach of the high and later middle ages. Aristotle's works were held in such esteem that he was known as The Philosopher. Dante calls Aristotle the ?master knower? and places him in Limbo with the Good Pagans such as Socrates and Plato in the Divine Comedy (Canto IV).

Indeed, the views of Aristotle became the dogma of scholastic philosophy. It was this dogma that was rejected by the philosophers of the early modern period, such as Galileo and Descartes.

Aristotle's theories about drama, in particular the idea of the dramatic unities, also influenced later playwrights, especially in France. He claimed to be describing the Greek theater, but his work was taken as prescriptive. In more recent times there has been a new revival of interest in Aristotle. His ethical views in particular remain influential.

See also: Aristotle's theory of universals, accidental properties

The article Aristotelian logic discusses the influence of Aristotle's Organon. See also the article Term Logic that outlines the system of traditional logic based on the Organon, that survived until the twentieth century.


Early life and studies at the Academe

Missing image
A bust of Aristotle is a nearly ubiquitous ornament in places of high culture in the West.

Aristotle was born at Stageira, a colony of Andros on the Macedonian peninsula Chalcidice in 384 BC. His father, Nicomachus, was court physician to King Amyntas III of Macedon. It is believed that Aristotle's ancestors held this position under various kings of Macedonia. As such, Aristotle's early education would probably have consisted of instruction in medicine and biology from his father. About his mother, Phaestis, little is known. It is known that she died early in Aristotle's life. When Nicomachus also died, in Aristotle's tenth year, he was left an orphan and placed under the guardianship of his uncle, Proxenus of Atarneus. He taught Aristotle Greek, rhetoric, and poetry (O'Connor et al., 2004). Aristotle was probably influenced by his father's medical knowledge; when he went to Athens at the age of 18, he was likely already trained in the investigation of natural phenomena.

From the ages of 18 to 37 Aristotle remained in Athens as a pupil of Plato and distinguished himself at the Academe. The relations between Plato and Aristotle have formed the subject of various legends, many of which depict Aristotle unfavourably. No doubt there were divergences of opinion between Plato, who took his stand on sublime, idealistic principles, and Aristotle, who even at that time showed a preference for the investigation of the facts and laws of the physical world. It is also probable that Plato suggested that Aristotle needed restraining rather than encouragement, but not that there was an open breach of friendship. In fact, Aristotle's conduct after the death of Plato, his continued association with Xenocrates and other Platonists, and his allusions in his writings to Plato's doctrines prove that while there were conflicts of opinion between Plato and Aristotle, there was no lack of cordial appreciation or mutual forbearance. Besides this, the legends that reflect Aristotle unfavourably are traceable to the Epicureans, who were known as slanderers. If such legends were circulated widely by patristic writers such as Justin Martyr and Gregory Nazianzen, the reason lies in the exaggerated esteem Aristotle was held in by the early Christian heretics, not in any well-grounded historical tradition.

Aristotle as Philosopher and Tutor

After the death of Plato (347 BC), Aristotle was considered as the next head of the Academe, a post that was eventually awarded to Plato's nephew. Aristotle then went with Xenocrates to the court of Hermias, ruler of Atarneus in Asia Minor, and married his niece and adopted daughter, Pythia. In 344 BC, Hermias was murdered in a rebellion (or a Persian attack?), and Aristotle went with his family to Mytilene. It is also reported that he stopped on Lesbos and briefly conducted biological research. Then, one or two years later, he was summoned to his native Stageira by King Philip II of Macedon to become the tutor of Alexander the Great, who was then 13.

Plutarch wrote that Aristotle not only imparted to Alexander a knowledge of ethics and politics, but also of the most profound secrets of philosophy. We have much proof that Alexander profited by contact with the philosopher, and that Aristotle made prudent and beneficial use of his influence over the young prince (although Bertrand Russell disputes this). Due to this influence, Alexander provided Aristotle with ample means for the acquisition of books and the pursuit of his scientific investigation.

According to sources such as Plutarch and Diogenes, Philip had Aristotle's hometown of Stageira burned during the 340s BC, and Aristotle successfully requested that Alexander rebuild it. During his tutorship of Alexander, Aristotle was reportedly considered a second time for leadership of the Academy; his companion Xenocrates was selected instead.

Founder and master of the Lyceum

In about 335 BC, Alexander departed for his Asiatic campaign, and Aristotle, who had served as an informal adviser (more or less) since Alexander ascended the Macedonian throne, returned to Athens and opened his own school of philosophy. He may, as Aulus Gellius says, have conducted a school of rhetoric during his former residence in Athens; but now, following Plato's example, he gave regular instruction in philosophy in a gymnasium dedicated to Apollo Lyceios, from which his school has come to be known as the Lyceum. (It was also called the Peripatetic School because Aristotle preferred to discuss problems of philosophy with his pupils while walking up and down -- peripateo -- the shaded walks -- peripatoi -- around the gymnasium.)

During the thirteen years (335 BC322 BC) which he spent as teacher of the Lyceum, Aristotle composed most of his writings. Imitating Plato, he wrote "Dialogues" in which his doctrines were expounded in somewhat popular language. He also composed the several treatises (which will be mentioned below) on physics, metaphysics, and so forth, in which the exposition is more didactic and the language more technical than in the "Dialogues". These writings show to what good use he put the resources Alexander had provided for him. They show particularly how he succeeded in bringing together the works of his predecessors in Greek philosophy, and how he pursued, either personally or through others, his investigations in the realm of natural phenomena. Pliny claimed that Alexander placed under Aristotle's orders all the hunters, fishermen, and fowlers of the royal kingdom and all the overseers of the royal forests, lakes, ponds and cattle-ranges, and Aristotle's works on zoology make this statement more believable. Aristotle was fully informed about the doctrines of his predecessors, and Strabo asserted that he was the first to accumulate a great library.

During the last years of Aristotle's life the relations between him and Alexander the Great became very strained, owing to the disgrace and punishment of Callisthenes whom Aristotle had recommended to Alexander. Nevertheless, Aristotle continued to be regarded at Athens as a friend of Alexander and a representative of Macedonia. Consequently, when Alexander's death became known in Athens, and the outbreak occurred which led to the Lamian war, Aristotle shared in the general unpopularity of the Macedonians. The charge of impiety, which had been brought against Anaxagoras and Socrates, was now, with even less reason, brought against Aristotle. He left the city, saying (according to many ancient authorities) that he would not give the Athenians a chance to sin a third time against philosophy. He took up residence at his country house at Chalcis, in Euboea, and there he died the following year, 322 BC. His death was due to a disease, reportedly 'of the stomach', from which he had long suffered. The story that his death was due to hemlock poisoning, as well as the legend that he threw himself into the sea "because he could not explain the tides," is without historical foundation.

Very little is known about Aristotle's personal appearance except from hostile sources. The statues and busts of Aristotle, possibly from the first years of the Peripatetic School, represent him as sharp and keen of countenance, and somewhat below the average height. His character—as revealed by his writings, his will (which is undoubtedly genuine), fragments of his letters and the allusions of his unprejudiced contemporaries—was that of a high-minded, kind-hearted man, devoted to his family and his friends, kind to his slaves, fair to his enemies and rivals, grateful towards his benefactors. When Platonism ceased to dominate the world of Christian speculation, and the works of Aristotle began to be studied without fear and prejudice, the personality of Aristotle appeared to the Christian writers of the 13th century, as it had to the unprejudiced pagan writers of his own day, as calm, majestic, untroubled by passion, and undimmed by any great moral defects, "the master of those who know".


Aristotle defines philosophy in terms of essence, saying that philosophy is "the science of the universal essence of that which is actual". Plato had defined it as the "science of the idea", meaning by idea what we should call the unconditional basis of phenomena. Both pupil and master regard philosophy as concerned with the universal; Aristotle, however, finds the universal in particular things, and called it the essence of things, while Plato finds that the universal exists apart from particular things, and is related to them as their prototype or exemplar. For Aristotle, therefore, philosophic method implies the ascent from the study of particular phenomena to the knowledge of essences, while for Plato philosophic method means the descent from a knowledge of universal ideas to a contemplation of particular imitations of those ideas. In a certain sense, Aristotle's method is both inductive and deductive, while Plato's is essentially deductive.

In Aristotle's terminology, the term natural philosophy corresponds to the phenomena of the natural world, which include: motion, light and the laws of physics. Many centuries later these subjects would later become the basis of modern science, as studied through the scientific method. The term philosophy is distinct from metaphysics, which is what moderns term philosophy.

In the larger sense of the word, he makes philosophy coextensive with reasoning, which he also called "science". Note, however, that his use of the term science carries a different meaning than that which is covered by the scientific method. "All science (dianoia) is either practical, poetical or theoretical." By practical science he understands ethics and politics; by poetical, he means the study of poetry and the other fine arts; while by theoretical philosophy he means physics, mathematics, and metaphysics.

The last, philosophy in the stricter sense, he defines as "the knowledge of immaterial being," and calls it "first philosophy", "the theologic science" or of "being in the highest degree of abstraction." If logic, or, as Aristotle calls it, Analytic, be regarded as a study preliminary to philosophy, we have as divisions of Aristotelian philosophy (1) Logic; (2) Theoretical Philosophy, including Metaphysics, Physics, Mathematics, (3) Practical Philosophy; and (4) Poetical Philosophy.

Aristotle's logic

Main article: Aristotelian logic


Aristotle "says that `on the subject of reasoning' he `had nothing else on an earlier date to speak about'" (Bocheński, 1951). However, Plato reports that syntax was thought of before him, by Prodikos of Keos, who was concerned by the right use of words. Logic seems to have emerged from dialectics, the earlier philosophers used concepts like reductio ad absurdum as rule when discussing, but never understood its logical implications. Even Plato had difficulties with logic. Although he had the idea of constructing a system for deduction, he was never able to construct one. Instead, he relied on his dialectic, which was a confusion between different sciences and methods (Bocheński, 1951). Plato thought that deduction would simply follow from premises, so he focused on having good premises so that the conclusion would follow. Later on, Plato realised that a method for obtaining the conclusion would be beneficial. Plato never obtained such a method, but his best attempt was published in his book Sophist, where he introduced his division method (Rose, 1968).

Analytics and the Organon

What we call today Aristotelian logic, Aristotle himself would have labelled analytics. The term logic he reserved to mean dialectics. Most of Aristotle's work is probably not authentic, since it was most likely edited by students and later lecturers. The logical works of Aristotle were compiled into six books at about the time of Christ:

  1. Categories
  2. On Interpretation
  3. Prior Analytics
  4. Posterior Analytics
  5. Topics
  6. On Sophistical Refutations

The order of the books (or the teachings from which they are composed) is not certain, but this list was derived from analysis of Aristotle's writings. There is one volume of Aristotle's concerning logic not found in the Organon, namely the fourth book of Metaphysics. (Bocheński, 1951).

Modal logic

Aristotle is also the creator of syllogisms with modalities (modal logic). The word modal refers to the word `modes', explaining the fact that modal logic deals with the modes of truth. Aristotle introduced the qualification of necessarily and possibly premises. He constructed a logic which helped in the evaluation of truth but which was very difficult to interpret. (Rose, 1968).

See also

Aristotelian science

Aristotelian discussions about science had only been qualitative, not quantitative. By the modern definition of the term, Aristotelian philosophy was not science, as this worldview did not attempt to probe how the world actually worked through experiment. For example, in his book "The history of animals" he claimed that human males have more teeth than female. Had he only made some observations, he would have found out that this claim is false.

Rather, based on what one's senses told one, Aristotelian philosophy then depended upon the assumption that man's mind could elucidate all the laws of the universe, based on simple observation (without experimentation) through reason alone.

One of the reasons for this was that Aristotle held that physics was about changing objects with a reality of their own, whereas mathematics was about unchanging objects without a reality of their own. In this philosophy, he could not imagine that there was a relationship between them.

In contrast, today the term science refers to the position that thinking alone often leads people astray, and therefore one must compare one's ideas to the actual world through experimentation; only then can one see if one's ideas are based in reality.

Aristotle's Four Causes

Aristotle names four "causes" of things, but the word cause (Greek: Template:PolytonicTemplate:PolytonicTemplate:PolytonicTemplate:PolytonicTemplate:Polytonic, aitia) is not used in the modern sense of "cause and effect", under which causes are events or states of affairs. Rather, the four causes are like different ways of explaining something:

The material cause 
This is the material that makes up an object, for example, "the bronze and silver ... are causes of the statue and the bowl."
The formal cause 
This is the blueprint or the idea commonly held of what an object should be. Aristotle says, "The form is the account (and the genera of the account) of the essence (for instance, the cause of an octave is the ratio two to one, and in general number), and the parts that are in the account."
The efficient cause 
This is the person who makes an object, or the unmoved mover (God) who moves nature. For example, "a father is a cause of his child; and in general the producer is a cause of the product and the initiator of the change is a cause." This is closest to the modern definition of "cause".
The final cause 
The final cause or telos is the purpose or end that something is supposed to serve. This includes "all the intermediate steps that are for the end ... for example, slimming, purging, drugs, or instruments are for health; all of these are for the end, though they differ in that some are activities while others are instruments."

An example of an artifact that has all four causes would be a table, which has material causes (wood and nails), a formal cause (the blueprint, or a generally agreed idea of what tables are), an efficient cause (the carpenter), and a final cause (using it to dine on).

Aristotle argues that natural objects such as an "individual man" have all four causes. The material cause of an individual man would be the flesh and bone that make up an individual man. The formal cause would be the blueprint of man, that which is used as a guide to create an individual man and to keep him in a certain state called man. The efficient cause of an individual man would be the father of that man, or in the case of all men the ?unmoved mover? God who breathed (anima-breath) into the soul (anima-Latin translation) of man. The final cause of man would be as Aristotle stated, ?Now we take the human?s function to be a certain kind of life, and take this life to be the soul?s activity and actions that express reason. Hence the excellent man?s function is to do this finely and well. Each function is completed well when its completion expresses the proper virtue. Therefore the human good turns out to be the souls? activity that expresses virtue.?

See also

The Difference Between Natural Objects and Artifacts

The difference between natural objects and an artifact is that natural objects have self movement. Aristotle defined the difference between a natural object and an artifact when he stated, ?In contrast to these, a bed, a cloak, or any other artifact-insofar as it is described as such i.e. as a bed, a cloak, or whatever, and to the extent that it is a product of a craft-has no innate impulse to change; but insofar as it is coincidentally made of stone or earth or a mixture of these, it has an innate impulse to change and just to that extent. This is because a nature is a type of principle and cause of motion and stability within those things to which it primarily belongs in their own right and not coincidentally.? The natural objects are changed to artifacts through crafts but they have an innate impulse of self movement to convert through time to their natural state, and they will all turn into that state when all animals with reason are extinct from earth.


Main article: Aristotelian theory of gravity

Aristotle's Ethics

Main article: Nicomachean Ethics

Although Aristotle wrote several works on Ethics, the major one was the Nicomachean Ethics, which is considered one of Aristotle's great works and discusses virtues. The ten books which comprise it are based on notes from his lectures at the Lyceum and were either edited by or dedicated to Aristotle's son, Nicomachus.

In Nicomachean Ethics, Aristotle focuses on the importance of continually behaving virtuously and developing virtue rather than committing specific good actions. This can be opposed to Kantian ethics, in which the primary focus is on individual action. Nicomachean Ethics emphasizes the importance of context to ethical behavior – what might be right in one situation might be wrong in another. Aristotle believed that happiness is the end of life and that as long as a person is striving for goodness, good deeds will result from that struggle, making the person virtuous and therefore happy.

Aristotle's critics

Aristotle has been criticised on several grounds.

  1. At times, the objections that Aristotle raises against the arguments of his own teacher, Plato, appear to rely on faulty interpretations of those arguments.
  2. Although Aristotle advised, against Plato, that knowledge of the world could only be obtained through experience, he frequently failed to take his own advice. Aristotle conducted projects of careful empirical investigation, but often drifted into abstract logical reasoning, with the result that his work was littered with conclusions that were not supported by empirical evidence; for example, his assertion that objects of different mass fall at different speeds under gravity, which was later refuted by Galileo.
  3. In the middle ages, roughly from the 12th century to the 15th century, the philosophy of Aristotle became firmly established dogma. Although Aristotle himself was far from dogmatic in his approach to philosophical inquiry, two aspects of his philosophy might have assisted its transformation into dogma. His works were wide ranging and systematic so that they could give the impression that no significant matter had been left unsettled. He was also much less inclined to employ the skeptical methods of his predecessors, Socrates and Plato.
  4. Some academics have suggested that Aristotle was unaware of much of the current science of his own time, and that he was a far lesser mathematician than many of his learned contemporaries.

Aristotle was called not a great philosopher, but "The Philosopher" by Scholastic thinkers. Scholastic thinkers blended Aristotelian philosophy with Christianity, bringing the thought of Ancient Greece into the Middle Ages. It required a repudiation of some Aristotelian principles for the sciences and the arts to free themselves for the discovery of modern scientific laws and empirical methods.

The Western mind is "Aristotelian". By this we mean that it formats the external world into factual and "scien"-tific categories. (By "Scien"-tific we mean that something is knowable or known.)

Under the premise of external categorization, the Aristotelian mind has come to equate "experience" with the unified chronical and spatial ontological structure that is the "external" universe -- visible, audible and sensible by the handful of our common, well-identified senses.

By so equating the two, the Aristotelian mind is fully confident, or fully "positive" of the meanings of its utterances and the purposes of all actions. That is to say, it dismisses the possibility of dubious meanings as interpreted by subjects that are at variance in perspectives or phenomenology, and it dismisses the importance of anything other than an objectively defined "purpose" to an action.

Therefore, the Aristotelian mind assumes that when subject A utters "I am X," he or she is referring to the same experience and is expressing the same purpose as subject B who also utters "I am X."


Note: Bekker numbers are often used to uniquely identify passages of Aristotle. They are identified below where available.

Major works

The extant works of Aristotle are broken down according to the five categories in the Corpus Aristotelicum. Not all of these works are considered genuine, but differ with respect to their connection to Aristotle, his associates and his views. Some, such as the Athenaion Politeia or the fragments of other politeia are regarded by most scholars as products of Aristotle's "school" and compiled under his direction or supervision. Other works, such "On Colors" may have been products of Aristotle's successors at the Lyceum, e.g., Theophrastus and Straton. Still others acquired Aristotle's name through similarities in doctrine or content, such as the De Plantis, possibly by Nicolaus of Damascus. A final category, omitted here, includes medieval palmistries, astrological and magical texts whose connection to Aristotle is purely fanciful and self-promotional. Those that are seriously disputed are marked with an asterisk.

Logical writings

Physical and scientific writings

Metaphysical writings

Ethical writings

Aesthetic writings

  • (1354a) Rhetoric (or "Ars Rhetorica", or "The Art of Rhetoric" or "Treatise on Rhetoric")
  • Rhetoric to Alexander (or "Rhetorica ad Alexandrum") *
  • (1447a) Poetics (or "Ars Poetica")

Writings absent from Corpus Aristotelicum

  • The Constitution of the Athenians (or "Athenaion Politeia", or "The Athenian Consitution") *
  • On Melissus, On Xenophanes, and On Gorgias. These are sometimes grouped together and called the "MXG" writings. They clearly are not written by Aristotle, and are believed to date from the fifth century AD. However, because they have frequently been attributed to him in the past, they are often included in compilations of his writings (for example, in the Loeb Classical Library.)

Specific editions

Named after Aristotle


  • Bocheński, I. M.: Ancient Formal Logic. North-Holland Publishing Company, Amsterdam, 1951.
  • Rose, Lynn E.: Aristotle's Syllogistic. Charles C Thomas Publisher, Springfield, 1968.

External links

  • O'Connor, J. John & Robertson, Edmund F., Aristotle (, 2004.

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