Quick Answer
The Idea of the Holy is Rudolf Otto's 1917 attempt to name the thing religion is actually about, which he called the numinous and analysed as mysterium tremendum et fascinans. The descriptive half is still the best writing on the subject in any language. The philosophical half rests on a claim that later scholarship has taken apart.
Key Takeaways
- Otto invented the word numinous because he judged that no existing term isolated what he meant, and the coinage is now standard across religious studies, psychology and literary criticism.
- The book came out of a Moroccan synagogue in 1911 or 1912, where he heard the threefold Holy sung and afterwards treated the moment as his discovery.
- The English title misleads. Otto's irrational means non-rational, and readers who take him as a defender of unreason have inverted his argument.
- The central objection is unanswered. If experience is shaped by the concepts a person already holds, there is no culture-free numinous encounter for Otto's theory to be about.
- The descriptions survive the criticism. Whatever happens to the philosophy, the phenomenology in chapters three through six remains unmatched.
🕑 15 min read
The Synagogue in Morocco
In 1911 and 1912 Rudolf Otto travelled from the Canary Islands to China and Japan on a study tour funded through the German government by the banker Albert Kahn, gathering material for an introduction to the history of religions.
Somewhere in Morocco he entered a synagogue on Yom Kippur. The building was poor, the congregation small, and the occasion the most solemn in the Jewish year. At the climax of the service he heard the trisagion, the seraphim's cry from the sixth chapter of Isaiah: holy, holy, holy.
Otto and his students afterwards treated that moment as the origin of everything he subsequently wrote. A German Lutheran theologian, standing in a Jewish congregation in North Africa, hearing a Hebrew text he already knew in a setting where it meant something he had not previously felt, and recognising in the gap between those two things a subject nobody had properly named.
Worth holding onto: the book that argues for a universal core in religious experience was produced by a specific man in a specific building on a specific holy day, hearing a text from his own scriptural tradition sung by people who were not of his religion. The circumstances are relevant to both the strength and the weakness of the argument, and Otto never quite reckoned with that.
What the Book Argues
Das Heilige appeared in 1917, in Germany, in the fourth year of a war that was destroying the confident liberal theology Otto had been trained in. It went through edition after edition and became one of the most widely read theological books of the century.
The question it asks is direct. Strip away doctrine, ethics, community and everything that can be stated in propositions. Is anything left? Otto's answer is that a great deal is left, that it is the actual content of religion, and that theology had allowed it to disappear by talking only about the parts that can be argued.
He calls the remainder the numinous, and analyses it in three terms that have been quoted ever since.
Mysterium. The wholly other, das ganz Andere. Not the merely unknown, which is something you could in principle come to know, but something that does not fit any category you possess. The reaction is stupor rather than curiosity.
Tremendum. The dread. Otto distinguishes this sharply from ordinary fear. Fear has an object within the world and a proportionate response. Numinous dread has neither, and its nearest secular relative is the feeling of the uncanny. He also includes here what he calls majestas, overwhelmingness, and energy, the sense of something urgent and active rather than static.
Fascinans. The attraction. This is the part that makes the analysis convincing, because it accounts for a fact that fear alone cannot. People go toward the thing. They seek it out, build institutions to encounter it again, and describe the encounter as the most valuable of their lives despite finding it terrifying. Any account of religion that leaves out this doubleness has missed what it is describing.
Alongside these he sets what he calls creature-feeling, the sense of one's own nothingness in the presence of the numinous, modelled on Abraham's line about being dust and ashes.
Why He Had to Invent a Word
Otto took numinous from the Latin numen, a divine power or presence, and the coinage matters more than it first appears.
The vocabulary available to him was all borrowed from somewhere else. Holy carried a moral sense: a holy person is a good person. Sacred implied an institution that had set something apart. Awe and reverence were emotional terms describing responses that also attach to mountains, music and monarchs. Every available word imported a framework, and the framework was exactly what Otto wanted to strip off in order to see what was underneath it.
The word worked. It escaped theology almost immediately, and it is now used without attribution by psychologists, literary critics, film reviewers and people who have never heard of Otto. Whatever happens to his philosophy, he supplied a term the language did not have and could not do without.
The test that shows what he means
Otto's distinction becomes clear on a single case. Standing before something vast and beautiful produces an emotion continuous with ordinary experience, larger in degree and the same in kind. The numinous, on his account, is not larger. It is different, and its signature is that the person encountering it feels that something is present rather than that something is impressive. Readers who have had the second sort of experience recognise the description immediately. Readers who have not often conclude that Otto is describing the first sort with extra adjectives.
The Texts He Reads
Otto is at his most persuasive when he stops theorising and takes a passage apart, and three of his readings are worth knowing on their own.
The whirlwind speeches in Job. This is his central exhibit and it is brilliant. God answers Job out of the storm with a long catalogue of wild things: the wild ass, the ostrich, the war horse, and finally Behemoth and Leviathan. Nothing in the speech addresses Job's question about justice. Otto's point is that the passage is nonetheless felt by every reader as a genuine answer, and that this is only explicable if what Job needed was not an argument. He was overwhelmed into satisfaction. The numinous does the work that the theodicy fails to do, and the author of Job appears to have known it.
Isaiah's vision in the temple. The threefold Holy, the shaking doorposts, the smoke, and the prophet's immediate response, which is not worship but the conviction that he is undone. Creature-feeling in its clearest scriptural form, and the passage Otto heard sung in Morocco.
The eleventh chapter of the Bhagavad Gita. Arjuna asks to see Krishna's true form, receives it, and is terrified past the point of endurance, begging for the ordinary form to return. Otto uses this to argue that the structure he is describing is not a Christian or even a Western artefact, and it is his single strongest cross-cultural case. Whether it establishes a common core or only a common human reaction to overwhelming imagery is precisely what his critics dispute.
Practice: read Job 38 to 41 in one sitting
Read the whirlwind speeches straight through without stopping to interpret. Notice what happens to your objection that Job's question went unanswered. If the passage works on you, and it works on most people, you have direct evidence for Otto's claim that something operates in religious language which argument does not reach. If it does not, you have learned something equally useful about how you are built. Either result is worth the twenty minutes.
The Title That Misleads
John W. Harvey's English translation appeared in 1923 and every edition since reprints it. It is a competent piece of work, and one decision in it has cost Otto a century of misreading.
The German subtitle concerns das Irrationale in the idea of the divine and its relation to the rational. Harvey renders this as the irrational, which in English means contrary to reason. Otto's German means non-rational: outside the domain reason handles, in the way that the taste of salt is outside it. He was not attacking reason. He was claiming that a category exists which rational analysis does not exhaust, and he devotes the second half of the book to showing how the non-rational and the rational are joined.
The consequence is predictable. Otto is regularly cited as a defender of irrationalism in religion, which inverts his actual position, and readers come to the book expecting mysticism against argument and find a Kantian philosopher of religion.
The Kantian Machinery
The second half of the book is where most readers stop, and it is where the argument actually lives.
Otto was working in a Kantian frame. Kant held that the mind brings certain categories to experience rather than deriving them from it, and that these categories are what make experience possible in the first place. Otto's proposal is that the holy is a category of exactly this sort: not learned from the world, not reducible to any other feeling, and belonging to the structure of the mind as an a priori capacity.
The word he uses for how this bare capacity becomes actual religion is schematisation. The numinous, by itself, is content-free dread and attraction. Rational and moral concepts are then applied to it, and the result is a religion with a God who is good, commands that can be stated, and doctrine that can be argued. Sin is the schematisation of creature-feeling by moral categories. Grace is the schematisation of fascinans.
This is a serious piece of philosophical construction and it explains why Otto thought he was doing something more than describing feelings. It also carries the weight of the whole book, and it is the part that has not held.
The Objection That Sticks
The strongest criticism is simple to state and has not been answered.
Otto requires an experience that arrives before interpretation, a raw numinous encounter that different traditions then dress in their own concepts. That is what makes his cross-cultural claim work: the Moroccan synagogue, the Vedic hymn and the Lutheran hymn all point at one thing, differently clothed.
Steven Katz, in work beginning in the late 1970s, and Wayne Proudfoot in Religious Experience in 1985, argued that no such raw layer exists. The concepts a person holds shape what they are able to experience, not only how they report it afterwards. A Buddhist practitioner and a Carmelite nun do not have the same experience and describe it differently; the traditions have formed the experiences themselves. On this account Otto's common core dissolves into a set of culturally specific encounters that resemble each other because human beings and human situations resemble each other.
Notice what the objection does and does not do. It does not claim that Otto's experiences did not occur, that they were trivial, or that religion reduces to something else. It claims that the philosophical machinery cannot be built, because the foundation stone, an uninterpreted experience, is not available for inspection. The descriptions remain valuable. The theory of a universal category underneath them cannot be tested and probably cannot be stated.
There is a related and more contained criticism: Otto's account leaves almost no room for the cognitive side of religious life, for thinking, judging and interpreting as constituents of the experience rather than as later additions. That objection appears in Proudfoot and in Philip Almond's work on Otto, and it is a fair reading of what the book actually says.
The Hierarchy Problem
Otto arranges religions on a developmental scale, from primitive stages in which the numinous appears as crude dread of demons, through progressively more refined forms, arriving at a rationally and morally schematised religion in which Lutheran Christianity sits comfortably at the summit.
This was standard for German scholarship in 1917 and it is not defensible now. His access to non-European traditions came through translations, missionary reports and the scholarly apparatus of a colonial era, and the scale he constructs reproduces that apparatus. Gregory Alles has examined the relationship between Otto's project and the cultural politics of the period directly, and the examination is not flattering.
The descriptive work can be separated from the evolutionary framing without much loss, and readers should do that separation consciously rather than absorb the hierarchy along with the analysis. Our review of Eliade's Sacred and the Profane deals with a successor who inherited both the insight and the problem.
What Survives
A great deal, and the influence is easier to trace than the argument.
Eliade built the comparative study of the sacred on Otto's foundation. Jung used the numinous throughout his later work and told correspondents that the approach to the numinous was the real therapy. Paul Tillich, Martin Heidegger and Karl Barth all engaged with him. C. S. Lewis absorbed the book early and his description of the difference between fear of a tiger and fear of a ghost, which opens The Problem of Pain, is Otto rendered into English prose so clear that many readers meet the idea there without knowing whose it is.
The phenomenological chapters have not been superseded. If you want the most accurate available description of what the experience is like from the inside, Otto is where you go, and that remains true whether or not the a priori category exists.
There is a difference worth naming between Otto's approach and the one this site generally works from. Otto's numinous arrives. The person is passive, overwhelmed, reduced to creature-feeling, and the encounter is something that happens to them. Rudolf Steiner's account of spiritual perception in The Philosophy of Freedom runs the other way: perception of the spiritual is a cognitive capacity that can be trained, and the person is active in it rather than flattened by it. Both descriptions correspond to something real. Which one a tradition emphasises tells you a great deal about what it expects of its adherents.
For the empirical parallel, William James's Varieties of Religious Experience arrives at overlapping territory fifteen years earlier from a psychological rather than a theological direction, and Maslow's peak experiences are the mid-century secular restatement.
Which Edition to Buy
Every English edition prints the Harvey translation of 1923, so the choice is about format rather than text.
The Oxford paperback is the standard reading copy and the one most academic references cite. Reprints of the first English edition are also in circulation and differ mainly in typesetting and in which appendices are included. Otto revised the German across many editions and added essays, so the appendix content varies more than the main text does.
If you read German, the original repays it, particularly for das Irrationale and das ganz Andere, both of which carry weight in German that the English flattens.
Who Should Read It
Read chapters three to six if you read nothing else. That is the phenomenology, it is under fifty pages, and it is the reason the book is still in print.
Read the whole thing if you are interested in philosophy of religion, or in how a Kantian argument gets built, or in the intellectual ancestry of Eliade, Jung and half of twentieth century religious studies.
Read Underhill's Mysticism alongside it for the practitioner's side, and Pseudo-Dionysius for the ancient source of the wholly-other language Otto is working with.
Skip it if you want a devotional book. Otto is describing an encounter, not commending one, and the register is academic throughout.
Our position: a century old book whose central philosophical claim has been dismantled and whose central description has never been bettered. Read it for the phenomenology, hold the a priori category loosely, ignore the developmental hierarchy, and remember that its author's own decisive experience happened in someone else's house of worship. The word he made is his real legacy, and it entered the language because there was nothing else to say.
The book that gave the experience its name.
Affiliate disclosure: Thalira earns a small commission on purchases made through the link above, at no additional cost to you. We recommend books we have read and think are worth your time, and we say plainly when we think parts of them are weak.
Frequently Asked Questions
What is The Idea of the Holy about?
Rudolf Otto's 1917 attempt to describe the element in religion that survives when doctrine and ethics are removed. He calls it the numinous, characterises it as mysterium tremendum et fascinans, and argues that it is a distinct category of experience rather than a variety of fear, wonder or moral feeling.
What does numinous mean?
Otto coined the word from the Latin numen, meaning a divine power or presence. It names the quality of an experience in which something is encountered as overwhelming, uncanny and wholly other, producing dread and attraction at the same time. He invented the term because he judged that no existing word isolated the thing he meant.
What is mysterium tremendum et fascinans?
Otto's three-part analysis. Mysterium is the wholly other, what cannot be assimilated to anything familiar. Tremendum is the awefulness, overwhelmingness and urgency that produces dread. Fascinans is the attraction that draws a person toward the very thing that terrifies them. The combination is what makes the experience distinctively religious.
What prompted Otto to write it?
An experience in a poor synagogue in Morocco during his world tour of 1911 and 1912, where he heard the trisagion from Isaiah, the threefold Holy, sung at the climax of the service. He and his students afterwards treated that moment as the origin of the book.
Is the book difficult to read?
The descriptive chapters are vivid and accessible. The philosophical chapters are Kantian and technical, dealing with the holy as an a priori category and with how it is schematised by rational and moral concepts. Most readers absorb the first half and skim the second, which is understandable and loses the argument.
What is the main objection to Otto?
That there is no such thing as an experience prior to interpretation. Steven Katz and Wayne Proudfoot argue that concepts a person already holds shape what they can experience, so a numinous encounter free of cultural conditioning is not available. If they are right, Otto's cross-cultural common core dissolves into a family of culturally specific experiences.
Which translation and edition should I buy?
John W. Harvey's English translation of 1923 is the standard and the one every edition reprints. The Oxford paperback is the usual reading copy. Reprints of the first English edition exist and differ mainly in the appendices and in typesetting. The translation choices matter more than the edition.
Why is the English title misleading?
The German subtitle concerns the irrational in the idea of the divine and its relation to the rational, and Otto's irrational means non-rational rather than contrary to reason. English readers routinely take him to be defending unreason, which reverses his position. He was arguing that a category exists which reason does not exhaust.
Who did the book influence?
Mircea Eliade built the study of the sacred on it. Carl Jung used the numinous throughout his later work. Paul Tillich, Martin Heidegger and C. S. Lewis all absorbed it, and Lewis's account of joy and of the uncanny in his own writing is directly indebted to Otto.
What is creature-feeling?
Otto's term for the sense of one's own nothingness in the presence of the numinous. He takes Abraham's line about being dust and ashes as the model. It is not humility as a virtue and not low self-esteem; it is the reflex recognition of being a contingent thing next to something that is not.
Is the colonialism criticism fair?
Partly. Otto arranges religions on a scale from primitive to developed with Lutheran Christianity near the top, and his access to non-European traditions came through the scholarly and colonial apparatus of his time. Scholars including Gregory Alles have examined this directly. The descriptive work survives the criticism; the evolutionary framing does not.
Is the numinous the same as awe?
Otto would say no and the distinction is his central claim. Awe at a mountain or a cathedral is continuous with ordinary emotion. The numinous involves an encounter with something experienced as wholly other, and the dread it produces is different in kind from fear of anything within the world.
Test the distinction on your own memory
Find an occasion when something moved you past ordinary emotion, and ask Otto's question about it. Was it impressiveness at a very large scale, or was there a sense that something was present? He claims those are different in kind. You are the only person who can check that against your own case, and checking it is more useful than any amount of reading about the numinous.
Sources & References
- Otto, R. (1917). Das Heilige. English translation by J. W. Harvey as The Idea of the Holy, Oxford University Press, 1923.
- Proudfoot, W. (1985). Religious Experience. University of California Press.
- Katz, S. T., ed. (1978). Mysticism and Philosophical Analysis. Oxford University Press.
- Almond, P. C. (1984). Rudolf Otto: An Introduction to His Philosophical Theology. University of North Carolina Press.
- Alles, G. D. "Rudolf Otto, cultural colonialism and the discovery of the holy." In studies on the history of religious studies.
- Eliade, M. (1957). The Sacred and the Profane. Harcourt.
- James, W. (1902). The Varieties of Religious Experience. Longmans, Green and Co.
- Lewis, C. S. (1940). The Problem of Pain. Geoffrey Bles.
- Encyclopaedia Britannica. Entries on Rudolf Otto and on mysterium tremendum et fascinans. britannica.com.