Plotinus and his Neoplatonic school exerted a deep and lasting influence on the philosophical, religious, and, importantly, mystical traditions of the Western and Near-Eastern worlds for over a thousand years. In fact, it would probably not be an overstatement to say that the work of Plotinus and his followers acts as the wellspring of the Western mystical and theological tradition, both in the Christian and Islamic worlds. For instance, Christian theologians attempting to characterize God’s nature through a method of “negative theology” reflected Plotinus’s argument that the ultimate divine principle was incapable of being circumscribed by any predicate, while Islamic philosophers often appropriated Neoplatonic notions of “emanation” to explain the apparent contradiction between a wholly transcendent God and the self-evident reality of the corporeal world.
Regardless, Plotinus’s contributions remain obscure relative to the other ancients, which probably shouldn’t be surprising given the hyper-materialist and positivist tenor of contemporary thought. While ancient thinkers like Aristotle, Socrates, and even Plato can be spun as admirable anticipators of the modern secular and scientific methods (however misleading this caricature can be), Plotinus is not susceptible to such an interpretation. In a sense, Plotinus’s Enneads is the summation and most radical statement of the idealist strain of ancient Greek thought --- for Plotinus, the physical world we inhabit is the terminal point and most faint expression of an enigmatic principle he refers to as the “One,” the infinitely powerful, transcendent, undivided, and supremely aloof ultimate principle.
The One is perhaps the main innovation Plotinus contributes to Greek thought. While Plato hinted at such a concept in dialogues like The Republic and Parmenides as a means of grappling with the transcendence of the Forms and their underlying unity, readers of Plato will recognize that it is generally not a central element of Plato’s system (if his dialogues can even be interpreted as advocating for a systemic philosophy). In contrast, Plotinus appropriates the concept and exalts it as the transcendent source of all “expressed principles.” While contemporary readers might see an obvious analogue to the Christian God in the One, this would be a mistaken impression, and the Neoplatonists were strongly critical of Christian division of the Godhead into the Trinity as well as their tendency to impart human characteristics like wrath, love, and even awareness to the ultimate principle. Neoplatonists like Plotinus saw the One as utterly impassive, self-sufficient, and simple; to imply that it experienced any concern with, or awareness of, the foibles of mortals introduced an unacceptable division of its simplicity. Plotinus relegated the act of creation to the mere third principle: Soul, a concept roughly analogous to Plato’s Demiurge, or the divine intelligence which shaped matter according to the transcendent Forms.
As alienating, even Lovecraftian, as the One may seem to a West accustomed to the notion of a personal deity, Plotinus’s account is suffused with a wonder and joy at the magnificence of the One and its emanations, and this acts as the inspiration for some of the Ennead’s most engrossing images. Often, he depicts a corporeal world whose order and beauty exist as a sort of divine efflorescence exuded by an inexhaustible source, and in this way, the One sustains reality through a sort of beneficent (albeit disinterested) outflowing.
There is a great deal to say about The Enneads, which is hopefully the case for any book pushing 900 pages in length. However, I would like to remark on the frequent criticism that this book embraces a sort of uncritical mysticism over genuine philosophical argument. Setting aside the unfortunate fact that mysticism has become a sort of hand-waving pejorative for any point of view that rejects or challenges scientific modernity, the fact of the matter is that The Enneads is a series of hard-nosed analytical philosophical treatises written squarely in the Greek philosophical tradition. Starting from a small number of initial premises, Plotinus constructs an internally coherent systematic philosophy that accounts for human psychology, motion, the cosmos, and their relationship to the Hypostases of Intellect and Soul via the mechanisms of emanation and return.
His account is mystical insofar as it attempts to address the lofty philosophical problems related to Being and its first principles, but this is generally the goal of all metaphysics carried out within the Greek tradition. At times, Plotinus does reject dialectical reason as a means of truly experiencing the One in favor of ecstatic union, but this is consistent with his overall characterization of the One and its relationship with Being and the corporeal world. How could the reasoning of a finite and imperfect intellect encompass the divine unity of the One? Reasoning itself implies division between subject and object, thesis and antithesis, problem and solution, but none of these polarities can be predicated of the One, according to Plotinus. For Plotinus, reasoning can only carry us so far towards the ultimate truth, and in my view, this expresses an important point about the nature of human reasoning. While contemporary science and scholarly methods rightly emphasize a sort of exhaustive articulation of problems through clear documentation and agreed-upon systems of symbolic languages, the cosmos and human experience within it are largely inexplicable in their totality, and growing towards truth means acknowledging that our accounts of things, as persuasive and well-argued as they might be, must inevitably fall short.
I found Plotinus’s depiction of a universe teeming with life, suffused with a divine and beneficent order, and emanating from a sublime and mysterious fountainhead that is simultaneously different yet immediately present to human subjectivity to be an engrossing and rewarding corrective to our dystopian and cynical age. This pivotal text is well worth a read (though a read-through is a tall order for most) for those interested in Platonism, the history of philosophy, and the origins of Western mystic and religious thought. Also, I urge you to purchase the Gerson version of the Enneads; without its extensive footnoting, clarifying notes, and its up-to-date translation, I’m afraid this difficult text would be rendered almost completely unintelligible.