School

Platonism

The philosophy of Plato and of the schools that interpreted him, from the Academy to the Middle Platonists.

Also called the Academy, Platonic philosophy

Introduction

Platonism is the philosophy of Plato and of the long tradition that took his dialogues as its inspiration. Its central conviction is that the world we perceive with the senses is not the whole of reality: beyond it are eternal, unchanging Forms, of which sensible things are images, and above the Forms is the Good, the source of their being and intelligibility.

For Platonism, the soul is akin to the Forms and immortal. Knowledge is recollection of what the soul once beheld, philosophy is the turning of the soul from shadows toward the light, and love is the soul’s ascent from beautiful bodies to Beauty itself. These images, the cave of the Republic and the ladder of love in the Symposium, have shaped Western ideas of spiritual ascent ever since.

Platonism was never a single doctrine. Plato wrote dialogues, not treatises, and his successors read him in very different ways: as a sceptic, a systematic metaphysician, or a theologian.

History

Historical

Plato founded the Academy in Athens around 387 BCE. Under his successors it continued for centuries, and in the third and second centuries BCE it took a sceptical turn under Arcesilaus and Carneades, who emphasized Socrates’ claim to know nothing.

From the first century BCE, the “Middle Platonists”, among them Philo of Alexandria, Plutarch, Alcinous and Numenius, returned to Plato’s metaphysics, joining it with Aristotelian and Stoic ideas and treating the Forms as thoughts in the mind of God. Philo, a Jew of Alexandria, read the Hebrew scriptures in Platonic terms, anticipating later Christian and Jewish theology.

In the third century CE, Plotinus transformed the tradition into what modern scholars call Neoplatonism. Through Augustine, the Greek Fathers and the Arabic philosophers, and later through the Florentine Academy of Marsilio Ficino in the fifteenth century, Platonism remained one of the main currents of Western thought, and in particular of its mystical theology.

399 BCEThe trial and death of Socrates
c. 387 BCEPlato founds the Academy in Athens
3rd–2nd c. BCEThe sceptical Academy of Arcesilaus and Carneades
1st c. BCE–2nd c. CEMiddle Platonism: Philo, Plutarch, Numenius
c. 244–270 CEPlotinus teaches in Rome
15th c.Marsilio Ficino’s Florentine Academy translates Plato and Plotinus

Major thinkers

Key concepts

Important texts

Convergence and divergence

Resemblance and difference, given equal room. Each note is marked with the kind of statement it makes.

Areas of convergence

Contemplation, with Christian Mysticism
Historical
Christian contemplative writers took over the Platonic language of ascent, purification and the vision of the Good, from Augustine and Gregory of Nyssa onward.

Areas of divergence

Soul, with Buddhism
Scholarship
Platonism affirms an immortal soul akin to the eternal; Buddhism denies a permanent self, though both describe the mind’s liberation from attachment to the changing world.

Cite this entry

Chicago (bibliography): “Platonism.” Tradition. The Library, Unitive Knowledge Society. Last modified November 7, 2026. https://www.unitiveknowledge.org/library/traditions/platonism.
Chicago (note): “Platonism,” tradition, The Library, Unitive Knowledge Society, last modified November 7, 2026, https://www.unitiveknowledge.org/library/traditions/platonism.
MLA: “Platonism.” The Library, Unitive Knowledge Society, 7 Nov. 2026, www.unitiveknowledge.org/library/traditions/platonism.
BibTeX: @misc{traditions-platonism, title = {{Platonism}}, howpublished = {The Library, Unitive Knowledge Society}, note = {Tradition. Last modified November 7, 2026}, year = {2026}, url = {https://www.unitiveknowledge.org/library/traditions/platonism} }

Parallels

Schools and branches

NeoplatonismSchoolThe late ancient Platonism of Plotinus and his successors, centred on the One and the soul’s return to it.