Numerology

Pythagoras and the early Pythagoreans

Andrew Gregory dates Pythagoras to about 570 to about 490 BCE and notes that he wrote nothing, so that what is known of him comes from much later and often unreliable sources. The Stanford Encyclopedia of Philosophy entry by Carl Huffman says Aristotle referred to "the so-called Pythagoreans" of the fifth and first half of the fourth century BCE, which leaves open how closely they were tied to Pythagoras himself.

In Aristotle's account, as Huffman reports it, the central thesis of the mainstream Pythagorean system was that things are numbers or are made of numbers. Gregory adds that some Pythagoreans attributed non-mathematical properties to numbers, for example associating 2 and 3 with male and female, 5 with marriage and 10 with a divine or special number.

What the Pythagorean evidence does not show

Gregory states that, as far as is known, the modern practice called Pythagorean numerology, which substitutes numbers for the letters of a name and combines them with a birth date, was not practised by the Pythagoreans, and he cites the scholarship of Walter Burkert for the absence of evidence. He adds that early Pythagoreans did not clearly separate mathematical from numerological interests. The word Pythagorean in modern numerology therefore names a claimed lineage, not an attested method.

Hebrew and Greek letter-numbers

Assigning numbers to letters is a separate and documented practice. The Encyclopaedia Judaica entry on gematria describes it as one of the aggadic rules for interpreting the Torah, derives the word from the Greek geometria, and gives as its earliest documented use an inscription of Sargon II (727 to 707 BCE) matching a wall length to the numerical value of his name. It also records the Greek parallel, isopsephia.

Britannica describes gematria as a method favoured by medieval Kabbalists for drawing mystical insight from sacred writings, and notes that some condemned it as mere toying with numbers. In these sources the practice is applied to scripture and divine names; the sources reviewed do not describe it being used to read a person's character from a birth date.

The modern English-alphabet system

The modern Western form can be traced in print to the early twentieth century. L. Dow Balliett's The Philosophy of Numbers: Their Tone and Colors was published in Atlantic City in 1908. Its title page lists anearlier work of hers on numbers "as taught by Pythagoras". The book divides the English alphabet into nine groups, gives each letter a digit from 1 to 9, and reads birth-date and name digits as vibrations linked to colours and notes. She attributes the method to Pythagoras, which Gregory does not support.

Catherine Yronwode's annotated bibliography, compiled by a non-academic writer, credits Balliett as originator and popular exponent of the master-number system and of the purely English-alphabet system. It says Julia Seton, a New Thought church founder, is said to have coined the word numerology, and that her daughter Juno Jordan studied with Balliett as a teenager. These attributions are the bibliography's own.

Numerology as a broad and a narrow term

Britannica defines numerology as the use of numbers to interpret a person's character or to divine the future, and says modern numerology attaches a series of digits to an inquirer's name and date of birth, using a method analogous to the Greek and Hebrew alphabets in which each letter also stood for a number. Gregory observes that there are many types of numerology, which is why attributing one type to a particular ancient group needs care.

Pythagorean, Chaldean and Kabbalistic labels

Pythagorean numerology is the label for the sequential system described above, in which letters take the values 1 to 9 in order. Balliett's table of this kind appears in her 1908 book, while Gregory's illustration of the method adds up letter positions and then reduces the total to a single digit. The name honours Pythagoras but, on Gregory's reading, does not describe his teaching.

Cheiro's Book of Numbers, an undated seventh impression published in London under the name Cheiro (Count Louis Hamon), says there are two schools, the Pythagorean and "the more ancient one known as the Chaldean". Cheiro says he learned his theories from a sect of Brahmins, calls his letter table the Chaldean and Hebrew alphabet, and writes that its origin is lost in antiquity but is believed to lie with the Chaldeans. These are the author's claims. None of the scholarly sources reviewed confirms a Babylonian origin, and his worked examples give some letters different values from the sequential table, for instance W as 6 where the sequential table gives 5.

Kabbalistic numerology is a modern label and not a term the Encyclopaedia Judaica or Britannica uses; both describe gematria, a letter-value method applied to texts within Jewish exegesis, and Greek isopsephia as its parallel. Similar letter-number methods in different cultures should not be treated as one tradition.

Terms in the early English texts

Balliett writes of vibrations, a birth digit or birth path, and name digits, and calls the numbers 8, 9, 11 and 22 free or unlimited numbers; Yronwode credits her with originating the master-number idea. Cheiro works with compound numbers, which are reduced to a single digit, as when 25 reduces to 7 in his reading of the name George Washington, and gives separate meanings to the compound totals. Terms such as vibration are the authors' own vocabulary and not measured quantities.

Calculation as described in the early texts

Gregory gives an illustration of the modern method: the letters of each name are converted to numbers and added, the total is reduced to a single digit by repeatedly adding its digits, the digits of the birth date are treated the same way, and each resulting key number is matched to a trait. He describes the manipulations as arbitrary and open to elaboration, and his trait labels are illustrative and not a standard table.

Balliett's book teaches the same arithmetic using her nine-part alphabet, reads vowels in a name as showing spiritual structure, and keeps 11 and 22 unreduced. Cheiro's book instead sums letters by his own table into a compound number, reduces it, and links the months of the year to planetary numbers and to lucky or unlucky days.

Associations attached to numbers

In Balliett's text each digit carries a colour and a musical note, and her index lists chapters on the esoteric value of gems and on furnishing rooms in a person's own colours. The associations are stated by the author and are not derived from measurement.

What the sources do not describe

The sources reviewed are books and reference works. They do not describe consultation length, fees, venues, record keeping, practitioner training or the usual conduct of a session. Balliett's book is framed as a set of exercises for readers to develop their own vibration, which is a self-study format and not a practitioner session. A reader considering a reading can ask what it is based on and whether it is offered as guidance, entertainment or prediction.

Claims in the early texts

Britannica summarises the claimed use as interpreting character and divining the future. Balliett's 1908 book goes further: it reads birth and name digits as indicating character and suitability for occupations, and states that a person chooses the time of birth in a past life to obtain a given vibration. It also says that a person who does not keep the source within pure will become depleted in vitality and suffer ill health and disease. That is a claim by the author within a religious frame, not a finding.

Cheiro's book offers reading of names and dates to identify lucky and unlucky days and applies the system to the dates of life events of public figures, including political crises in France and the 1914 to 1918 war. Such accounts were assembled after the events and are presented without tests.

Numbers as cultural symbols

A review in International Review of Psychiatry describes numbers as culturally relative symbols, ranging from superstition and foreboding to auspiciousness in different societies, and says that numbers arguably play a role in the experience of distress or wellness. The review concerns number symbolism broadly and does not test personal numerology readings. The sources reviewed contain no survey of why people consult numerologists.

Searches and what they found

The searches run for this page were PubMed for numerology in the title or abstract, which returned 52 records, and two literature-search services for numerology combined with personality, belief, name numbers and trials. Most PubMed records use the word figuratively, as in radio-network numerology or numerology of cell counts, or concern number symbolism in historical Chinese medicine. No randomised trial, controlled study of numerology readings, or systematic review of numerology was found. Other databases and the psychology and religious studies literature were not searched exhaustively.

An observational test of name and birth-date numbers

One observational study from Australia analysed 2,215 consecutive adults admitted with self-poisoning in the Hunter Valley between January 1987 and June 1993, looking at circadian, weekly and lunar patterns and at whether patients' names or birth dates, analysed by numerology, biorhythms and star sign, were associated with the event. The authors reported no significant correlation for numerology, biorhythms or star signs. This tested one outcome in one region, did not evaluate readings or wellbeing, and was available to this review only as an abstract.

Why generalised descriptions can feel personal

A 1988 paper on cold reading defines the Barnum effect as the tendency to accept generalised personality descriptions as one's own and says cold reading by astrologers, palm readers, Tarot readers and spirit mediums depends initially on it. Numerology is not named in the abstract, and no study identified here measured whether the Barnum effect explains reactions to numerology readings. The paper offers a psychological account of why readings can seem accurate, and it is not evidence about numerology itself.

Testability and historical claims

Gregory quotes the philosopher David Stove, who wrote that philosophers use numerology as a stock example of thought gone wrong but cannot say exactly what is wrong with it, with the usual answers being unverifiability or unfalsifiability. Gregory also separates the modern system from Pythagorean thought, so a claim that modern readings carry ancient authority is not supported by the scholarship he cites.

Reading early texts critically

Balliett's book also applies its digits to the names of states and countries. Its passage on Africa uses period language about the continent and its people that modern readers may find offensive, and it presents the character of peoples as readable from the vowels of a place name. How later numerologists have treated such passages is not covered by the sources reviewed.

Limits of this evidence base

The research above is thin and indirect: one observational abstract and one general paper on cold reading. The history rests partly on early practitioners' own books and on a bibliography written outside academic history. Absence of controlled studies means the claims have not been tested, which is not the same as showing they are false for every person or purpose.

Harms and the limits of the sources

None of the sources reviewed reports adverse events from numerology readings, and none studies harms, costs or consumer complaints, so neither the presence nor the absence of harm can be inferred. The historical texts reviewed include statements linking vibration, spiritual alignment and health, and statements about past lives; such claims are beliefs and should not be treated as health information.

Care boundaries

A reading is not an assessment of health, finances or legal matters, and it should not delay or replace necessary medical or mental health care or professional advice. Predictions about timing or compatibility rest on no tested method in the sources reviewed, so a person making a significant decision may wish to check any such statement against other information.

Training and regulation

The sources reviewed do not cover training, certification, professional codes or regulation of numerology in any jurisdiction, and no jurisdiction was checked. Requirements differ by country and region, and a reader can ask a practitioner about their background and about how any fee is set before agreeing to a reading.