Plato's Dualism: The Theory of Forms and the Soul

Platonic Dualism: The Theory of Forms and Reality

Platonic dualism: Plato's conception of reality is dualist, distinguishing between the sensible world of physical objects—which are variable, imperfect, and mere appearances based on what we know through our senses—and another world of universal, permanent, and perfect realities known through the soul in the true rational world.

Beyond the physical world, Plato defined the World of Ideas (or Forms). These Ideas are objective, real, and not mere concepts. Ideas have an existence separate from sensible things; they are the perfect models of the physical objects in our world. They enclose the true being of things, their essence. The World of Ideas is not a disordered conglomerate; it forms a system of necessary relations and hierarchy. In his work The Republic, the Idea of the Good is the maximum unifying principle and the highest of all Ideas.

The Nature of Knowledge

The dualism between the sensible and the intelligible, the material and the spiritual, is also demonstrated in the human being. Man is a compendium of two worlds: the body, which belongs to the sensible world, and the soul, which is the rational principle of life. The destiny of man is to "exit the cave" and live according to reason and the Ideas.

Plato distinguishes two types of knowledge:

• Doxa (Opinion): It starts with sensation and images. It allows for belief and the forged vision we have of the world. This is the result of opinion; it is imperfect, variable, and superficial knowledge.
• Episteme (Science): This is true knowledge that allows one to know the truth and the essence of things through intellectual knowledge, disregarding the senses. Thus, the episteme allows one to know the Ideas and deduce their relations through the dialectic method, which allows the transition from the sensible to the intelligible. Only those who achieve this can reach the maximum level of being and live justly in both private and public life.

The Nature of the Soul

In Plato's philosophy, the human being is also a composite of two realities: body and soul. The body is the prison of the soul; it is material, mortal, and belongs to the imperfect sensible world. The soul is the principle that animates the body; it is spiritual and immortal, belonging to the World of Ideas. While the soul is united to the body, it aspires to return to the World of Ideas, making the union between the two elements transient and accidental.

The Three Parts of the Soul

The soul consists of three parts that perform different functions:

• Rational Soul: Located in the head, it is immortal and divine. It is the superior part, and its function is intellectual knowledge and directing the other two inferior parts. Its virtue is prudence.
• Irascible Soul: Located in the chest, it is mortal and the origin of noble and good passions. Its function is courage and will, and its virtue is fortitude.
• Concupiscible Soul: Located in the belly, it is mortal and the origin of human passions and instincts. Its virtue is temperance.