The One
For Plotinus, the first principle of reality is "the One", an utterly simple, ineffable,
unknowable subsistence which is both the creative source and the teleological end of all existing things. Although, properly speaking, there is no name appropriate for the first principle, the most adequate names are "the One" or "the Good". The One is so simple that it cannot even be said to exist or to be a being. Rather, the creative principle of all things is beyond being, a notion which is derived from Book VI of the Republic, when, in the course of his famous analogy of the sun, Plato says that the
Good is beyond being (ἐπέκεινα τῆς οὐσίας)
in power and dignity. In
Plotinus' model of reality, the One is the cause of the rest of reality, which takes the form of two subsequent "hypostases" or substances:[B] Nous and Soul.[/B] Although neoplatonists after Plotinus adhered to his cosmological scheme in its most general outline, later developments in the tradition also departed substantively from Plotinus' teachings in regards to significant philosophical issues, such as the nature of evil.
Demiurge or Nous
The original Being initially emanates, or throws out, the nous, which is a perfect image of the One and the archetype of all existing things. It is simultaneously both being and thought, idea and ideal world. As image, the nous corresponds perfectly to the One, but as derivative, it is entirely different. What Plotinus understands by the nous is the highest sphere accessible to the human mind, while also being pure intellect itself. Nous is the most critical component of idealism, Neoplatonism being a pure form of idealism.
The demiurge (the nous) is the energy, or ergon (does the work), which manifests or organises the material world into perceivability.
The world-soul
The image and product of the motionless nous is the world-soul, which, according to Plotinus, is immaterial like the nous. Its relation to the nous is the same as that of the nous to the One.
It stands between the nous and the phenomenal world, and it is permeated and illuminated by the former, but it is also in contact with the latter. The nous/spirit is indivisible; the world-soul may preserve its unity and remain in the nous, but, at the same time, it has the power of uniting with the corporeal world and thus being disintegrated. It therefore occupies an intermediate position. As a single world-soul, it belongs in essence and destination to the intelligible world; but it also embraces innumerable individual souls; and these can either allow themselves to be informed by the nous, or turn aside from the nous and choose the phenomenal world and lose themselves in the realm of the senses and the finite.
The phenomenal world
The soul, as a moving essence, generates the corporeal or phenomenal world. This world ought to be so pervaded by the soul that its various parts should remain in perfect harmony. Plotinus is no dualist in the same sense as sects like the Gnostics; in contrast, he admires the beauty and splendour of the world. So long as idea governs matter, or the soul governs the body, the world is fair and good. It is an image – though a shadowy image – of the upper world, and the degrees of better and worse in it are essential to the harmony of the whole. But, in the actual phenomenal world, unity and harmony are replaced by strife or discord; the result is a conflict, a becoming and vanishing, an illusive existence. And the reason for this state of things is that bodies rest on a substratum of matter. Matter is the indeterminate: that with no qualities. If destitute of form and idea, it is evil; as capable of form, it is neutral.
Evil here is understood as a parasite, having no-existence of its own (parahypostasis), an unavoidable outcome of the Universe, having an "other"
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