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Anima mundi

Concept in metaphysics

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Through Common Era, Renaissance and Mathematics

In ancient philosophy, Plato's dialogue Timaeus introduces the universe as a living creature endowed with a soul and reason, constructed by the demiurge according to a rational pattern expressed through mathematical principles. Plato describes the world soul as a mixture of sameness and difference, forming a unified, harmonious entity that permeates the cosmos. This soul animates the universe, ensuring its rational structure and function according to a divine plan, with the motions of the seven classical planets reflecting the deep connection between mathematics and reality in Platonic thought.

Stoicism and Gnosticism are two significant philosophical systems that elaborated on this concept. Stoicism, founded by Zeno of Citium in the early 3rd century BCE, posited that the universe is a single, living entity permeated by the divine rational principle known as the logos, which organizes and animates the cosmos, functioning as its soul. Gnosticism, emerging in the early centuries of the Common Era, often associates the world soul with Sophia, who embodies divine wisdom and the descent into the material world. Gnostics believed that esoteric knowledge could transcend the material world and reunite with the divine.

Neoplatonism and Hermeticism also incorporated the concept of the world soul into their cosmologies. Neoplatonism, flourishing in the 3rd century CE through philosophers like Plotinus and Proclus, proposed a hierarchical structure of existence with the World Soul acting as an intermediary between the intelligible realm and the material world, animating and organizing the cosmos. Hermeticism, based on writings attributed to Hermes Trismegistus, views the world soul as a vital force uniting the cosmos. Hermetic texts describe the cosmos as a living being imbued with a divine spirit, emphasizing the unity and interconnection of all things. Aligning oneself with the world soul is seen as a path to spiritual enlightenment and union with the divine, a belief that experienced a resurgence during the Renaissance when Hermeticism was revived and integrated into Renaissance thought, influencing various intellectual and spiritual movements of the time.

Ancient philosophy

Plato

Plato described the universe as a living being in his dialogue Timaeus (30b–d):

Thus, then, in accordance with the likely account, we must declare that this Cosmos has verily come into existence as a Living Creature endowed with soul and reason [...] a Living Creature, one and visible, containing within itself all the living creatures which are by nature akin to itself.

Plato's Timaeus describes this living cosmos as being built by the demiurge, constructed to be self-identical and intelligible to reason, according to a rational pattern expressed in mathematical principles and Pythagorean ratios describing the structure of the cosmos, and particularly the motions of the seven classical planets. The living universe is also a god titled Ouranos and Kosmos, which shows, as scholars have argued, that Plato mediates between the poetic and presocratic traditions.

In Timaeus, Plato presents the cosmos as a single, living organism that possesses a soul and intelligence. The demiurge, a divine craftsman, creates the universe by imposing order on pre-existing chaotic matter. This creation is not ex nihilo but rather a process of organizing the cosmos according to the eternal Forms, which are perfect, immutable archetypes of all things.

Plato explains that the world soul is a mixture of the same and the different, woven together to form a unified, harmonious entity. This soul permeates the entire cosmos, animating it and endowing it with life and intelligence. The world soul is responsible for the rational structure of the universe, ensuring that everything functions according to a divine plan.

The rational pattern of the cosmos is expressed through mathematical principles and Pythagorean ratios, reflecting the deep connection between mathematics and the structure of reality in Platonic thought. The motions of the seven classical planets (the Moon, Mercury, Venus, the Sun, Mars, Jupiter, and Saturn) are particularly significant, as they embody the harmony and order of the universe.

Plato's identification of the cosmos as a god, titled Ouranos and Kosmos, reveals his synthesis of different philosophical traditions. The name Ouranos connects the world soul to the ancient Greek personification of the sky, while Kosmos signifies order and beauty. By mediating between poetic and presocratic traditions, Plato integrates mythological and philosophical elements into a coherent cosmological vision.

Stoicism

The Stoic school of philosophy, founded by Zeno of Citium in the early 3rd century BCE, significantly contributed to the development of the concept of the world soul. Stoicism posits that the universe is a single, living entity permeated by a divine rational principle known as the logos. This principle organizes and animates the cosmos, functioning as its soul.

Central to Stoic cosmology is the belief that the logos operates as the rational structure underlying all existence. This rational principle is equated with God, nature, and the soul of the universe, making the cosmos a living, rational organism. The Stoics identified the world soul with the concept of pneuma, a life-giving force that pervades and sustains all things. Pneuma is a mixture of air and fire, elements considered active and capable of bestowing life and motion.

The Stoic philosopher Cleanthes described the world soul in his "Hymn to Zeus", where he praises Zeus (a personification of the logos) for harmonizing the cosmos and ensuring its rational order. Chrysippus, another prominent Stoic, further developed the idea of the world soul, arguing that it is the animating principle that ensures the coherence and unity of the cosmos.

The Stoic view of the world soul differs from Plato's in that it emphasizes the materiality of the pneuma. For the Stoics, the soul of the universe is not an abstract, separate entity but a physical presence that interpenetrates the cosmos, providing it with structure and purpose. This physicalist interpretation reflects the Stoic commitment to the idea that only bodies can act and be acted upon.

The Stoic concept of the world soul also has ethical implications. Since the logos governs the cosmos rationally, living in accordance with nature means aligning one's life with this rational order. The Stoics believed that by understanding and accepting the world's rational structure, individuals could achieve a state of tranquility and virtue.

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