The One

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Note added at 1 hr (2016-04-26 18:48:55 GMT)
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2. The Three Fundamental Principles of Plotinus' Metaphysics

The three basic principles of Plotinus' metaphysics are called by him ‘the One’ (or, equivalently, ‘the Good’), Intellect, and Soul (see V 1; V 9.). These principles are both ultimate ontological realities and explanatory principles. Plotinus believed that they were recognized by Plato as such, as well as by the entire subsequent Platonic tradition.

The One is the absolutely simple first principle of all. It is both ‘self-caused’ and the cause of being for everything else in the universe.
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http://plato.stanford.edu/entries/plotinus/

It is the One that unifies as the Good and as Beauty: things are one insofar as they participate in the One, and return to it in loving it: “beauty is that which irradiates symmetry rather than symmetry itself and is that which truly calls out our love.” [VI.7.22, MacKenna] Plotinus here suggests that we naturally love the unity from which we come, and that our love for this unity can only alight upon something insofar as that thing is unified, insofar as it is one thing, intelligible, brought together by the Beauty that composes it as a unity.
https://intotheclarities.com/2015/12/30/plotinus-augustine-a...

https://archive.org/stream/plotinusonbeauti00plotrich/plotin...