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The One

In Neoplatonism, the One (τὸ ἕν) is the ineffable source beyond Being from which all reality emanates — distinct from Parmenides' One, which is Being itself, single and indivisible.

The One (to hen) is the supreme first principle of Neoplatonism, given its definitive form by Plotinus in 3rd-century-CE Rome. It is an absolutely simple, undivided source beyond being and knowledge, from which all reality 'emanates,' or overflows: first Intellect (Nous), then Soul, then the material world. Plotinus built the idea from Parmenides' unity and from Plato's 'Parmenides' and 'Republic,' where the Good is said to lie 'beyond being.' The doctrine became the master template for mystical and negative theology across Christian, Islamic, and Jewish traditions, in which God is described not by what He is but by what He is not.

A note on the Shema (Deuteronomy 6:4): readers sometimes hear in its declaration — "Hear, O Israel: the LORD our God, the LORD is one (echad)" — an early statement of the Neoplatonic One, the supreme metaphysical principle. The resemblance is verbal, and it does not survive a look at what the verse is actually saying.

In its own setting, echad asserts that the LORD alone is Israel's God — the single, unique deity to whom this people owes its undivided loyalty, against the many gods of the surrounding nations. The claim is at once about God's oneness and about covenant: "you shall love the LORD your God with all your heart" follows immediately (Deuteronomy 6:5). This God speaks, commands, remembers, and acts in history; the surrounding verses are about teaching children, binding words upon the hand, writing them on the doorposts (Deuteronomy 6:7-9). "One" here means there is no other beside Him (compare Deuteronomy 4:35, "the LORD is God; there is none else besides Him"). It is the oneness of a personal sovereign, not a description of His metaphysical rank.

Plotinus's One is a different kind of claim entirely. It is not a person who chooses or commands, but a supra-essential source "beyond being" — so utterly simple that it transcends even existence and knowledge, ineffable because every predicate would introduce multiplicity into it. From it all reality necessarily overflows by emanation, descending through a graded hierarchy of hypostases (Intellect, then Soul, then the sensible world). The One does not love a people or enter a covenant; it does not act by will at all. Its "oneness" is the absence of all plurality at the summit of a metaphysical ladder — a very different thing from the numerical and exclusive oneness the Shema proclaims of a God who redeems and commands.

These are genuinely distinct ideas: the covenantal uniqueness of a personal God is not the supra-essential One beyond being. Neoplatonic emanation entered Jewish thought only later — decisively in the medieval period, when philosophers working in the wake of the falasifa drew on emanationist language to interpret Scripture. Reading the One back into Deuteronomy is therefore anachronistic, and that is why the Shema is kept separate from this concept.

How it traveled

Parmenides
Athens · -370
explains
Metaphysics
Chalcis · -322
explains
Enneades
Rome · 270
explains
Duties of the Heart
Zaragoza (Saragossa) · 1080
Guide for the Perplexed
Cairo · 1190
Sha'arei Orah
Guadalajara · 1260
Sha'arei Tzedek
Castile · 1265
Zohar
Guadalajara · 1280
Tikkunei Zohar
Guadalajara · 1280
Zohar Chadash
Guadalajara · 1290
Sefer HaKanah
Castile · 1380
Sefer HaIkkarim
Soria · 1425
Akeidat Yitzchak
Tarragona · 1490
exposition
Abarbanel on Torah
Naples · 1505
Avodat HaKodesh (Ibn Gabbai)
Cairo · 1523
Pardes Rimmonim
Tzfat · 1548
Ketem Paz on Zohar
Tzfat · 1561
Sha'ar HaKavanot
Tzfat · 1570
Sha'ar HaGilgulim
Tzfat · 1570
Sha'ar Ma'amarei Rashbi
Tzfat · 1570
Sha'ar Ma'amarei Razal
Tzfat · 1570
Pri Etz Chaim
Tzfat · 1572
Reshit Chokhmah
Tzfat · 1575
Sha'ar HaHakdamot
Tzfat · 1610
Sha'ar Ruach HaKodesh
Damascus · 1610
Ohr HaChammah on Zohar
Tzfat · 1620
Mikdash Melekh, RaMaZ Commentary on Zohar
Tzfat · 1680
Kalach Pitchei Chokhmah
Padua · 1730
Da'at Tevunot
Padua · 1735
Mikdash Melekh on Zohar
Tzfat · 1750
Yahel Ohr on Zohar
Vilna (Vilnius) · 1790
Tanya
Liadi · 1797
Maor VaShemesh
Krakow (Cracow) · 1817
Sha'arei HaYichud VeEmunah
Strashelye · 1820
Sha'arei Avodah
Strashelye · 1820
Likutei Halakhot
Breslov (Ukraine) · 1840
BePardes HaChasidut VeHakabbalah
Warsaw · 1910
Talmud Eser HaSefirot
Jerusalem · 1939
Sulam on Zohar
Jerusalem · 1945
Ohr Penimi on Talmud Eser HaSefirot
Jerusalem · 1948

Key passages(20)

Guide for the Perplexed, Part 1 57:4↗

Guide for the Perplexed · Moses ben Maimon (Rambam) · 1190 CE