Platonism encompasses the philosophical doctrines of Plato and subsequent systems closely derived from them, often contrasted with nominalism or anti-realism. This philosophical tradition has profoundly influenced Western thought. Platonism, also known as Platonic realism, postulates the objective reality of Forms or abstract entities, primarily addressing the problem of universals. These abstract entities are posited to inhabit a distinct third realm, separate from both the empirical external world and the subjective internal sphere of consciousness. This conceptual framework extends to properties, types, propositions, meanings, numbers, sets, and truth values.
Plato's philosophy initially sought to reconcile the perceptible yet unintelligible reality, linked to Heraclitean flux and investigated by empirical sciences, with the imperceptible yet intelligible reality, associated with Parmenidean immutable being and explored through mathematics. Plato's primary motivation stemmed from geometry, reflecting a significant Pythagorean influence. In dialogues such as the Phaedo, Symposium, and Republic, the Forms are characteristically depicted as perfect archetypes, of which mundane objects are mere imperfect copies. Aristotle's Third Man Argument represents its most renowned critique from antiquity.
Plato founded the Academy. During the 3rd century BC, Arcesilaus introduced academic skepticism, which served as a foundational principle for the institution until 90 BC, when Antiochus incorporated Stoic components, repudiated skepticism, and initiated the era of Middle Platonism. Subsequently, in the 3rd century AD, Plotinus integrated further mystical dimensions, thereby establishing Neoplatonism, wherein the ultimate apex of existence was identified as the One or the Good, the primordial source of all phenomena. Through the practice of virtue and meditation, the soul possessed the capacity to ascend and achieve union with this ultimate One.
Numerous Platonic concepts were assimilated by the Christian Church, particularly the Roman Catholic Church, which interpreted Plato's Forms as divine thoughts, a stance also termed divine conceptualism. Concurrently, Neoplatonism profoundly shaped Christian mysticism in the Western tradition, notably through Saint Augustine, a Doctor of the Catholic Church, whose intellectual framework was significantly informed by Plotinus' Enneads, thereby laying foundational elements for Western Christian theology. Platonic principles experienced subsequent resurgence during the Renaissance and within contemporary analytic philosophy, particularly with the emergence of mathematical platonism in modern philosophy of mathematics.
Philosophy
Central to this philosophy is the Theory of Forms. Genuine existence is posited to reside solely in these Forms—eternal, immutable, and perfect archetypes—of which all particular objects perceived by the senses are but imperfect imitations. The myriad sensory objects, being subject to perpetual flux, are consequently deemed devoid of true being. The quantity of Forms corresponds to the number of universal concepts derivable from specific sensory experiences. The subsequent passage exemplifies Plato's middle period metaphysics and epistemology:
[Socrates:] "Since the beautiful is opposite of the ugly, they are two."
Glaucon affirmed, "Certainly."
"And given their duality, is each entity singular?"
"I concur with that assertion as well."
"This principle similarly applies to concepts such as justice and injustice, good and evil, and all other Forms. Each Form is inherently singular, yet its pervasive manifestation in conjunction with actions, physical entities, and other Forms creates the perception of multiplicity."
"Precisely."
"Therefore, I propose a distinction: on one hand, there are those you recently termed lovers of sights, crafts, and practical individuals; on the other, are those currently under discussion, whom one would exclusively designate as philosophers."
"Could you elaborate on that distinction?"
"Those who appreciate sights and sounds are drawn to beautiful sounds, colors, shapes, and all creations derived from them; however, their intellect cannot perceive or comprehend the essence of beauty itself."
"Undoubtedly."
"Indeed, only a select few possess the capacity to apprehend beauty itself in its pure form. Is that not correct?"
"Absolutely."
"Consider an individual who acknowledges beautiful objects but denies the existence of beauty itself, and is incapable of following guidance toward its knowledge. Would you not contend that such a person exists in a dream-like state rather than one of wakefulness? Is dreaming not, whether conscious or unconscious, the conviction that a mere likeness is not a representation but the actual entity it resembles?"
"I unequivocally agree that such an individual is experiencing a dream."
"Conversely, an individual who believes in beauty itself, perceiving both it and the entities that partake in it, without mistaking the participants for the essence or the essence for the participants—is this person dreaming or awake?"
"Such a person is undeniably awake."(Republic Book V, 475e-476d, translated by G. M. A. Grube)
In Book VI of the Republic, the Form of the Good is posited as the supreme form, serving as the origin of all other Ideas and the foundation upon which the existence and comprehension of all other Forms depend. Knowledge of true being, specifically the Forms, cannot be acquired through sensory impressions. Instead, it is attainable solely through the soul's intrinsic activity, detached from sensory distractions and disturbances, which implies the rigorous application of reason. Dialectic, functioning as the primary scientific method in this endeavor, guides individuals toward an understanding of the Forms and ultimately to the highest Form of the Good. Subsequent Neoplatonic thought, initiated by Plotinus, equated the Good described in the Republic with the transcendent, absolute One presented in the first hypothesis of the Parmenides (137c-142a).
Platonist ethical theory is fundamentally rooted in the Form of the Good. Virtue is conceptualized as knowledge, specifically the apprehension of this supreme form. Given that the three components of the soul—reason, spirit, and appetite—each contribute to this cognitive process, three cardinal virtues emerge: Wisdom, Courage, and Moderation. The unifying principle among these virtues is Justice, which ensures that each part of the soul operates exclusively within its designated function.
Platonism exerted a profound influence on Western intellectual traditions. Numerous interpretations of the Timaeus suggest that Platonism, akin to Aristotelianism, posits an eternal universe, contrasting with the proximate Judaic tradition that asserts a universe created within historical time with a continuous, recorded history. Distinct from Aristotelianism, Platonism prioritizes ideas over matter and equates the individual with the soul. Consequently, many Platonic concepts became enduring elements within Christian theology.
Central to Plato's philosophical system is the theory of the soul. Francis Cornford identified the dual foundational tenets of Platonism as, firstly, the theory of the Forms and, secondly, the doctrine of the soul's immortality.
History
Ancient Philosophy
The Academy
Platonism was initially articulated in Plato's dialogues, where Socrates serves as a conduit for the exposition of specific doctrines, whose congruence with the historical Socrates's actual philosophy remains a subject of scholarly debate. Plato conducted his lectures within the Platonic Academy, a sacred grove situated beyond the Athenian city walls. This institution persisted at the same location for a considerable duration following Plato's demise. Its history is conventionally divided into three distinct phases: the Old, Middle, and New Academy. Prominent figures of the Old Academy included Speusippus (Plato's nephew), who assumed leadership of the institution until 339 BC, and Xenocrates, who led until 313 BC. Both scholars endeavored to integrate Pythagorean numerical theories with Plato's foundational theory of Forms.
The Skeptical Academy
Approximately 266 BC, Arcesilaus assumed leadership of the Academy. This period, designated as the Middle Academy, was marked by a pronounced emphasis on philosophical skepticism. Its defining characteristic was its critique of Stoic philosophy, particularly their claims regarding the certainty of truth and human epistemic capacity. The New Academy commenced with Carneades in 155 BC, who was the fourth successor to Arcesilaus in the leadership. This phase largely retained its skeptical orientation, rejecting the feasibility of apprehending absolute truth. Both Arcesilaus and Carneades contended that their skeptical positions were consistent with authentic Platonic principles.
Middle Platonism
Approximately 90 BC, Antiochus of Ascalon repudiated skepticism, thereby initiating the era termed Middle Platonism, wherein Platonic thought was synthesized with specific Peripatetic and numerous Stoic doctrines. Within Middle Platonism, the Platonic Forms were reconceptualized as immanent within rational intellects rather than transcendent entities; concomitantly, the material cosmos was understood as a living, animated entity, identified as the World-Soul. Plutarch held a position of significant intellectual prominence during this epoch. The syncretic character of Platonism during this period is evidenced by its integration into Pythagoreanism, notably by Numenius of Apamea, and into Jewish philosophy, exemplified by Philo of Alexandria.
Neoplatonism
During the third century, Plotinus reinterpreted and systematized Platonic philosophy, thereby founding Neoplatonism, a doctrine that integrated Middle Platonism with mystical elements. At the apex of this metaphysical hierarchy resides the One, or the Good, posited as the ultimate origin of all phenomena. From this One emanates, as if a reflection of its own essence, the Intellect, or nous, which encompasses an inexhaustible repository of Forms. The World-Soul, conceived as an emanation and reflection of the nous, is generated by and contained within it, mirroring the relationship of the nous to the One. Furthermore, by imbuing inherently non-existent matter, the World-Soul constitutes physical bodies, whose very existence is sustained within it. Consequently, nature is understood as a unified totality, imbued with both life and soul. The individual soul, constrained by its material embodiment, yearns to transcend corporeal limitations and revert to its primordial origin. Through the cultivation of virtue and rigorous philosophical contemplation, the soul possesses the capacity to ascend beyond discursive reason into an ecstatic state, enabling it to apprehend, or unite with, the singular, primary Good, which lies beyond the grasp of intellect. The ultimate purpose of human existence is thus posited as the achievement of this unitive experience with the Good, or the One.
Plotinus's disciple, Porphyry, and subsequently Iamblichus, further elaborated this philosophical system, often in deliberate contradistinction to nascent Christianity, even though numerous influential early Christian theologians drew upon Neoplatonic concepts for their formulations of monotheistic doctrine. The Platonic Academy experienced a re-establishment during this era, with Proclus (d. 485), a distinguished exegete of Plato's works, serving as its most eminent leader. The institution continued its operations until its closure by the Roman Emperor Justinian in 529 CE.
Medieval philosophy
Christianity and Platonism
Neoplatonism exerted a discernible influence on Christian thought, particularly through the contributions of Clement of Alexandria, Origen, and the Cappadocian Fathers. Saint Augustine was also profoundly shaped by Platonism, which he accessed via Marius Victorinus's Latin translations of the writings of Porphyry and/or Plotinus.
During the Middle Ages, Platonism held a position of considerable intellectual authority. Furthermore, Platonic philosophy impacted both Eastern and Western mystical traditions. Concurrently, Platonism informed the work of various philosophers, including those associated with the School of Chartres. Although Aristotelian thought gained greater prominence than Platonic philosophy in the 13th century, the philosophical system of Saint Thomas Aquinas retained fundamentally Platonic elements in several key aspects.
Modern philosophy
Renaissance
The Renaissance period witnessed a resurgence of interest in Platonic thought, extending to a direct engagement with Plato's own writings. Marsilio Ficino's Florentine Academy represented a deliberate endeavor to resurrect the spirit and structure of Plato's original Academy. Notable members of this academy included Giovanni Pico della Mirandola.
Plato's philosophical concepts significantly influenced numerous religious thinkers in 16th-, 17th-, and 19th-century England, notably the Cambridge Platonists. Conversely, orthodox Protestantism in continental Europe frequently expressed skepticism towards natural reason and often criticized Platonism. A notable challenge in the early modern European reception of Plato's works involved addressing the homosexual themes present within his writings.
The term Christoplatonism denotes a dualistic perspective attributed to Plato, which posits that spirit is inherently good while matter is inherently evil. This viewpoint influenced certain Christian denominations, despite its direct contradiction of biblical teachings, leading to ongoing criticism from many contemporary Christian educators. The Methodist Church, for instance, asserts that Christoplatonism is in direct opposition to "the Biblical record of God calling everything He created good."
Contemporary Philosophy
Modern Platonism
Beyond the historical iterations of Platonism, which emerged from figures like Plato and Plotinus, a modern conceptualization involves the theory of abstract objects.
Platonism, in its contemporary interpretation, asserts the existence of abstract objects—entities that are neither spatial nor temporal, and thus are entirely non-physical and non-mental. This particular understanding of Platonism represents a modern philosophical stance.
This modern Platonism has garnered support, in various forms and at different times, from numerous philosophers, including Bernard Bolzano, who advocated for anti-psychologism. Plato's writings exerted a profound influence on 20th-century thinkers such as Alfred North Whitehead, contributing to his Process Philosophy, and on Nicolai Hartmann's critical realism and metaphysics.
Analytic Philosophy
Within contemporary philosophy, the majority of Platonists attribute their foundational concepts to Gottlob Frege's seminal paper "Thought," which champions Platonism concerning propositions, and his influential work, The Foundations of Arithmetic, a foundational text for the logicist program that advocates for Platonism regarding numbers. Prominent contemporary analytic philosophers who embraced metaphysical Platonism include Bertrand Russell, Alonzo Church, Kurt Gödel, W. V. O. Quine, David Kaplan, Saul Kripke, Edward Zalta, and Peter van Inwagen. Iris Murdoch also adopted Platonism within moral philosophy, as articulated in her 1970 publication, The Sovereignty of Good.
Paul Benacerraf's epistemological critique of contemporary Platonism has emerged as its most significant challenge.
Continental Philosophy
Within contemporary Continental philosophy, Edmund Husserl's arguments opposing psychologism are widely considered to stem from a Platonist understanding of logic, shaped by the influence of Frege and his mentor Bolzano. Husserl explicitly cited Bolzano, G. W. Leibniz, and Hermann Lotze as inspirations for his stance in his Logical Investigations (1900–1901). Other notable contemporary Continental philosophers who have engaged with Platonism in a broader context include Leo Strauss, Simone Weil, and Alain Badiou.
Religious Influence
Platonism has profoundly impacted not only the 'orthodox' doctrines of Christianity and Islam but also the gnostic or esoteric 'heterodox' traditions prevalent in the ancient world, including Manichaeism, Mandaeism, and Hermeticism. During the European Renaissance, scholarship on Hermeticism and direct Platonic philosophy—alongside other esoteric and philosophical studies like Jewish magic and mysticism and Islamic alchemy—contributed to the magic and alchemy of that era, representing a synthesis of various Platonic philosophical interpretations.
Julius Evola integrated Platonic metaphysics into his concept of a Roman pagan revival, consistent with his Traditionalist critique of modern society. Arturo Reghini, an Italian esotericist and associate of Evola, similarly advanced Neoplatonic concepts in his endeavors to revitalize ancient Roman religious practices.
Alchemy
- Alchemy
- Hermeticism
- Innatism
- List of Ancient Platonists
- Plato's Unwritten Doctrines; Debates on Plato's Esotericism
- World Soul
Notable Figures
- Harold F. Cherniss, a scholar specializing in the relationship between Plato and Aristotle.
Notes
References
Ackermann, C. The Christian Element in Plato and the Platonic Philosophy. Translated by Asbury Samuel Ralph. Edinburgh: T. & T. Clark, 1861.
- Ackermann, C. The Christian Element in Plato and the Platonic philosophy. Translated by Asbury Samuel Ralph. Edinburgh: T. & T. Clark, 1861.
- Cassirer, Ernst. The Platonic Renaissance in England. Translated by James P. Pettegrove. Edinburgh: Nelson, 1953.
- Dorter, Kenneth. 1982. Plato's Phaedo: An Interpretation. Toronto: University of Toronto Press.
- Crombie, Ian. 1962. An Examination of Plato's Doctrines, vol. 1. London: Routledge.
- Frede, Dorothea. 1978. "The Final Proof of the Immortality of the Soul in Plato's Phaedo 102a–107a." Phronesis, 23.1: 27–41.
- Kristeller, Paul Oskar. "Renaissance Platonism." In Renaissance Thought: The Classic, Scholastic, and Humanistic Strains. New York: Harper, 1961.
- Walker, Daniel Pickering. The Ancient Theology: Studies in Christian Platonism from the Fifteenth to the Eighteenth Century. London: Duckworth, 1972.
- Christian Platonism and Christian Neoplatonism
- Islamic Platonists and Neoplatonists